Difference between revisions of "M3 GMC"

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{{Specs-Card|code=us_halftrack_m3_75mm_gmc}}
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{{About
 +
| about = American tank destroyer '''{{PAGENAME}}'''
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| other
 +
| usage-1 = other half-track vehicles based on the M3
 +
| link-1 = M3 Half-Track (Family)
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| usage-2 = other uses
 +
| link-2 = M3 (Disambiguation)
 +
}}
 +
{{Specs-Card
 +
|code=us_halftrack_m3_75mm_gmc
 +
|images={{Specs-Card-Image|GarageImage_{{PAGENAME}}.jpg|ArtImage_{{PAGENAME}}.png}}
 +
}}
  
 
== Description ==
 
== Description ==
−
''In the description, the first part needs to be about the history of the creation and combat usage of the vehicle, as well as its key features. In the second part, tell the reader about the ground vehicle in the game. Insert the screenshot of the vehicle. If the novice player does not remember the vehicle by name, they will immediately understand what kind of vehicle it is talking about.''
+
<!-- ''In the description, the first part should be about the history of the creation and combat usage of the vehicle, as well as its key features. In the second part, tell the reader about the ground vehicle in the game. Insert a screenshot of the vehicle, so that if the novice player does not remember the vehicle by name, he will immediately understand what kind of vehicle the article is talking about.'' -->
 +
 
 +
When the German Wehrmacht overrun France in 1940, the US Army began to re-evaluate their anti-tank strategy and inventory to face the Panzer Divisions. The result was the Tank Destroyer Branch in 1941 with its own dedicated tank destroyer vehicles to destroy German tanks. The urgency of setting up the branch caused the first vehicles to be more akin of an improvised weapon, resulting in the M3 Gun Motor Carriage (GMC), which consisted of a M3 half-track with a French 75 mm cannon installed on top. Despite the slapdash construction, the vehicle was approved for service and up to 2,200 were produced between 1941 to 1943, seeing combat in both the Pacific, North Africa, and Italian theaters. The M3 GMC would be slowly be replaced by the more powerful [[M10 GMC]], equipped with the larger 3-inch M7 gun.
 +
 
 +
The '''{{Specs|pseudonym}}''' was introduced in [[Update 1.49 "Weapons of Victory"]] as an American tank destroyer. The half-track construction does not inspire confidence in the vehicle's survivability, but the 75 mm gun packs a punch at its rank placement. However, the 75 mm gun suffers from a prolonged reload time, requiring users to make careful shot placements and make sure they have tactics to stay safe during the reload time. The M3 GMC can be a complicated tank destroyer to play with its vulnerabilities, but can enable players to bring to battle a large gun capable of decimating the opponent it hits, a good weapon to bring against the occasional medium or heavy tanks that could be seen in Rank I battles.
  
 
== General info ==
 
== General info ==
 
=== Survivability and armour ===
 
=== Survivability and armour ===
−
''Describe armour protection. Note the most well protected and key weak areas. Appreciate the layout of modules as well as the number and location of crew members. Is the level of armour protection sufficient, is the placement of modules helpfull for survival in combat?''
+
{{Specs-Tank-Armour}}
 +
<!-- ''Describe armour protection. Note the most well protected and key weak areas. Appreciate the layout of modules as well as the number and location of crew members. Is the level of armour protection sufficient, is the placement of modules helpful for survival in combat? If necessary use a visual template to indicate the most secure and weak zones of the armour.'' -->
 +
Just about any enemy is deadly to the 75 mm GMC M3, as the armour will only stop small-calibre machine gun rounds. Every tank cannon will penetrate the armour. Vehicles with autocannons or heavy machines guns are often the deadliest for the crew, especially strafing aircraft. The vehicle can also be easily destroyed by overpressure: HE shells and artillery strikes are thus very dangerous.
 +
 
 +
'''Armour type:'''
  
−
''If necessary use a visual template to indicate the most secure and weak zones of the armour.''
+
* Rolled homogeneous armour
 +
* Structural steel (back side)
 +
 
 +
{| class="wikitable"
 +
|-
 +
! Armour !! Front !! Sides !! Rear !! Roof
 +
|-
 +
| Hull || 6.35 mm (31°) || 6.35 mm || 6.35 mm || N/A
 +
|-
 +
| Turret (Gun shield) || 12.7 mm || 12.7 mm || N/A || 12.7 mm
 +
|-
 +
|}
 +
'''Notes:'''
 +
 
 +
* Tracks are 7 mm thick.
 +
* Road wheels are 2 mm of rubber.
 +
* Structural chassis thickness is 15 mm throughout.
  
 
=== Mobility ===
 
=== Mobility ===
−
''Write about the mobility of the ground vehicle. Estimate the specific power and maneuverability as well as the maximum speed forward and backward.''
+
{{Specs-Tank-Mobility}}
 +
<!-- ''Write about the mobility of the ground vehicle. Estimate the specific power and manoeuvrability, as well as the maximum speed forwards and backwards.'' -->
 +
 
 +
{{tankMobility|abMinHp=210|rbMinHp=131}}
 +
 
 +
=== Modifications and economy ===
 +
{{Specs-Economy}}
 +
 
 +
As with all tanks, Parts and FPE should be your first priority. After that you may want to pick up the M61 shot for an overall much more lethal round, with better penetration and some explosive filler. Beyond that, crew replenishment should be a priority; how you get there is personal preference between mobility improvements or gun handling. Both paths have merit, but seeing as the role of the M3 is more of a longer range support vehicle, gun handling would likely provide a greater benefit for most players.
  
 
== Armaments ==
 
== Armaments ==
 +
{{Specs-Tank-Armaments}}
 
=== Main armament ===
 
=== Main armament ===
−
''Give the reader information about the characteristics of the main gun. Assess its effectiveness in a battle based on the reloading speed, ballistics and the power of shells. Do not forget about the flexibilty of the fire, that is how quickly the cannon can be aimed at the target, open fire on it and aim at another enemy. Add a link to the main article on the gun: <code><nowiki>{{main|Name of the weapon}}</nowiki></code>. Describe in general terms the ammunition available for the main gun. Give advice on how to use them and how to fill the ammunition storage.''
+
{{Specs-Tank-Weapon|1}}
 +
<!-- ''Give the reader information about the characteristics of the main gun. Assess its effectiveness in a battle based on the reloading speed, ballistics and the power of shells. Do not forget about the flexibility of the fire, that is how quickly the cannon can be aimed at the target, open fire on it and aim at another enemy. Add a link to the main article on the gun: <code><nowiki>{{main|Name of the weapon}}</nowiki></code>. Describe in general terms the ammunition available for the main gun. Give advice on how to use them and how to fill the ammunition storage.'' -->
 +
{{main|M1897A4 (75 mm)}}
 +
 
 +
{| class="wikitable" style="text-align:center" width="100%"
 +
|-
 +
! colspan="5" | [[M1897A4 (75 mm)|75 mm M1897A4]] || colspan="5" | Turret rotation speed (°/s) || colspan="4" | Reloading rate (seconds)
 +
|-
 +
! Mode !! Capacity !! Vertical !! Horizontal !! Stabilizer
 +
! Stock !! Upgraded !! Full !! Expert !! Aced
 +
! Stock !! Full !! Expert !! Aced
 +
|-
 +
! ''Arcade''
 +
| rowspan="2" | 60 || rowspan="2" | -10°/+29° || rowspan="2" | -19°/+21° || rowspan="2" | N/A || 5.3 || 7.3 || 8.9 || 9.8 || 10.5 || rowspan="2" | 7.80 || rowspan="2" | 6.90 || rowspan="2" | 6.36 || rowspan="2" | 6.00
 +
|-
 +
! ''Realistic''
 +
| 3.6 || 4.2 || 5.1 || 5.6 || 6.0
 +
|-
 +
|}
 +
 
 +
==== Ammunition ====
 +
{{:M1897A4 (75 mm)/Ammunition|M72 shot, M48 shell, M61 shot, M89}}
 +
 
 +
==== [[Ammo racks]] ====
 +
[[File:Ammoracks_{{PAGENAME}}.png|right|thumb|x250px|[[Ammo racks]] of the {{PAGENAME}}]]
 +
<!-- '''Last updated:''' -->
 +
{| class="wikitable" style="text-align:center"
 +
|-
 +
! Full<br>ammo
 +
! 1st<br>rack empty
 +
! 2nd<br>rack empty
 +
! Visual<br>discrepancy
 +
|-
 +
| '''60''' || 31&nbsp;''(+29)'' || 1&nbsp;''(+59)'' || Yes
 +
|-
 +
|}
  
−
=== Additional armament ===
+
== Usage in battles ==
−
''Some tanks are armed with several guns in one or more turrets. Evaluate the additional weaponry and give advice on its use. Describe the ammunition available for additional weaponry. Give advice on how to use them and how to fill the ammunition storage. If there is no additional weaponry remove this subsection.''
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<!-- ''Describe the tactics of playing in the vehicle, the features of using vehicles in the team and advice on tactics. Refrain from creating a "guide" - do not impose a single point of view but instead give the reader food for thought. Describe the most dangerous enemies and give recommendations on fighting them. If necessary, note the specifics of the game in different modes (AB, RB, SB).'' -->
  
−
=== Machine guns ===
+
The 75 mm GMC M3 cannot go toe-to-toe with other tanks due to the lack of protection for the crew and insufficient armour layout. The armour can only stop rifle-calibre rounds from machine guns, and could possibly deflect 12.7 mm rounds off the frontal arc, but this vehicle was never designed to fight other tanks head-to-head. Its playstyle may generally confuse new or inexperienced players, as they would bring the vehicle up close to the front.
−
''Offensive and anti-aircraft machine guns not only allow you to fight some aircraft, but also are effective against lightly armoured vehicles. Evaluate machine guns and give recommendations on its use.''
 
  
−
== Usage in the battles ==
+
The vehicle was mainly purposed for destroying tanks at a distance, hence the amazing penetration values with the gun at its battle rating. It will still penetrate tanks of its BR and rank even at 500 m, which means staying from afar is the best way to play this particular vehicle. However, relocating after successive shots is another good idea. It prevents returning fire from the enemy, especially artillery strikes. It is not wise to bring this vehicle upfront, as it will probably not survive long with rigorous combat. However, the M3 GMC can be quite deadly up close as well if it manages to take the enemy by surprise. If planning to go up front, stock up on the M61 shot, which will increase the gun's lethality to tanks due to its internal HE charge. Keep in mind that this vehicle has to be supported by teammates, experienced players will take note of it's long to reload and may try to rush out and destroy the M3 GMC during the reloads. Effective use of its excellent reverse speed to take cover or back out of enemy fire will increase the chances of surviving. Overall, this vehicle is an effective tank destroyer for its rank, rivalling the [[ZiS-30]]. It combines the penetration ability of the ZiS-30 on to a larger calibre weapon, at the same time marrying the weapon on to the M3 half-track, which is already blessed with exceptional mobility.
−
''Describe the tactics of playing in the vehicle, the features of using vehicles in the team and advice on tactics. Refrain from creating a "guide" - do not impose a single point of view but give the reader food for thought. Describe the most dangerous enemies and give recommendations on fighting them. If necessary, note the specifics of the game in different modes (AB, RB, SB).''
+
 
 +
The low fire rate can be a fatal downfall for many newer players; always stay in cover while reloading. Many players will stay out in the open while they wait for the gun to reload; this is a deadly mistake.
  
 
=== Pros and cons ===
 
=== Pros and cons ===
−
''Summarize and briefly evaluate the vehicle in terms of its characteristics and combat effectiveness. Mark its pros and cons in a bulleted list. Do not use more than 6 points for each of the characteristics. Avoid using categorical definitions such as "bad", "good" and the like - they have a substitution in the form of softer "inadequate", "effective".''
+
<!-- ''Summarise and briefly evaluate the vehicle in terms of its characteristics and combat effectiveness. Mark its pros and cons in a bulleted list. Try not to use more than 6 points for each of the characteristics. Avoid using categorical definitions such as "bad", "good" and the like - use substitutions with softer forms such as "inadequate" and "effective".'' -->
  
 
'''Pros:'''
 
'''Pros:'''
−
*
+
 
 +
* Powerful cannon for its rank
 +
* Good mobility
 +
* Post-penetration damage of the M61 shot is deadly
 +
* Exceptional reverse speed
 +
* Acceleration is best when compared to other tank destroyers of its rank
 +
* Two spare crew members before efficiency is compromised
  
 
'''Cons:'''
 
'''Cons:'''
−
*
 
  
−
== Historical part ==
+
* New players may find the large turn radius of this vehicle very hard to use
−
''Describe the history of the creation and combat usage of the ground vehicle in more detail than in the introduction. If the historical reference turns out to be too big, take it to a separate article, taking a link to an article about the vehicle and adding a block "/historical reference" (example: https://wiki.warthunder.com/Name-vehicles/historical reference) and add a link to it here using the <code>main</code> template. Be sure to include links to sources at the end of the article.''
+
* Lightly armoured, will only withstand 7.92 mm rounds effectively
 +
* Any cannon round will penetrate this vehicle anywhere
 +
* Vulnerable to strafing aircraft
 +
* Entire crew is exposed, can be incapacitated by overpressure (HE shells, artillery strikes)
 +
* Commander and loader are in-line with each other when viewing from the front, and same for the driver and gunner
 +
* Poor reload time, slower than most other cannons at the rank
 +
* Stock AP shell has poor post-penetration damage
 +
* Limited traverse and slow traverse speed for the cannon
 +
 
 +
== History ==
 +
<!-- ''Describe the history of the creation and combat usage of the vehicle in more detail than in the introduction. If the historical reference turns out to be too long, take it to a separate article, taking a link to the article about the vehicle and adding a block "/History" (example: <nowiki>https://wiki.warthunder.com/(Vehicle-name)/History</nowiki>) and add a link to it here using the <code>main</code> template. Be sure to reference text and sources by using <code><nowiki><ref></ref></nowiki></code>, as well as adding them at the end of the article with <code><nowiki><references /></nowiki></code>. This section may also include the vehicle's dev blog entry (if applicable) and the in-game encyclopedia description (under <code><nowiki>=== In-game description ===</nowiki></code>, also if applicable).'' -->
 +
===Development===
 +
In the opening stages of World War II, the American military leaders realize they did not have any adequate anti-tank weaponry to repel a German tank assault. An urgent request for one developed into something akin of an improvised weapon.
 +
[[File:75mm_M3_GMC.jpg|x200px|left|thumb|none|A 75 mm GMC M3.]]
 +
 
 +
Army development took an M3 half-track and placed the French [[M1897A4 (75 mm)|75 mm Gun M1897A4]] gun onto it with a huge gun shield to protect the crew. This experimental vehicle was called the ''T12'', and was deemed to work well enough to be adopted and standardized in October 1941 as the '''75 mm GMC M3'''. From 1941 to 1943, about 2,200 units were produced, but many were converted back to standard half-tracks before they got issued, so it resulted in only about 842 units seeing combat service.
 +
 
 +
The M3 GMC was not particularly a protected vehicle given that it used a half-track as its basis, giving it rather limited protection for the crew. The gun crew on the half-track has a huge gun shield to take cover behind as they ready the weapon, but the truck driver and passenger would have no protection available. The French 75 mm Gun M1897A4 attached was a multi-purpose artillery piece, it could fire an armour piercing shell that could penetrate 81 mm of armour at 500 yards in a direct-fire role, and could hit targets up to 9,200 yards in an indirect-fire role. The 75 mm gun could only traverse in a limited arc forward, unable to traverse to face the back. Nevertheless, for a rushed production, the vehicle was deemed acceptable for use.
 +
 
 +
===Combat service===
 +
[[File:Acorn Inn 75mm M3 GMC_NA22387.jpg|x300px|right|thumb|A 75 mm M3 GMC in British service firing in an artillery role in the Italian theater.]]
 +
The vehicles saw service first in the Philippines when the Japanese invaded in December 1942, used to fend off Japanese vehicles and infantry. When the Japanese conquered the Philippines, they captured the 75 mm GMC M3s and used them against U.S. Forces when they invaded the Philippines in October 1944. The largest concentration of the 75 mm GMC M3 was in the North African Campaign, and then again in the Sicilian Campaign. During the Sicilian campaign, it was gradually phased out for the [[M10 GMC|3-inch Gun Motor Carriage M10]] as it was starting to become obsolete, but it stayed as a support weapon as assault guns for special forces. In the Pacific, they saw further use in the Marine Corps blasting Japanese tanks and fortifications on the major island battles before being gradually replaced by the 105 mm artillery on the M7 Priest.
 +
 
 +
The British, French, and Philippine Army were the few Allies who got their hands on the 75 mm GMC M3. In British terminology, it was known as the ''75 mm SP, Autocar''. The Free French forces used some M3 GMC in the Western Front during the invasion of France. The Philippine forces used the M3 GMC when the U.S. supplied their military there with it. The Philippines retained the M3 GMC up to the 1960s, being used by a number of factions, from the Japanese when they captured it in the 1940s, the rebels of the Hukbalahap Rebellion, and in the Korean War by the Philippine Expeditionary Force.
 +
 
 +
{{break}}
 +
{{Navigation-Start|{{Annotation|Archive of the in-game description|An archive of the historical description of the vehicle that was presented in-game prior to Update 1.55 'Royal Armour'}}}}
 +
{{Navigation-First-Simple-Line}}
 +
This self-propelled artillery installation was built in 1941 on the base of the M3 semitrack transporter by installing a modified version of an old French cannon onto it. It was released right up until 1943 and was unsuccessful as an anti-tank vehicle due to its poor armament and minimal armour.
 +
{{Navigation-End}}
  
 
== Media ==
 
== Media ==
−
''An excellent addition to the article will be video guides, as well as screenshots from the game and photos.''
+
<!-- ''Excellent additions to the article would be video guides, screenshots from the game, and photos.'' -->
  
−
== Read also ==
+
;Skins
−
''Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example,''
+
 
 +
* [https://live.warthunder.com/feed/camouflages/?vehicle=us_halftrack_m3_75mm_gmc Skins and camouflages for the {{PAGENAME}} from live.warthunder.com.]
 +
 
 +
;Videos
 +
{{Youtube-gallery|jB988Jwdfws|'''Talisman Series (Tanks) M3 GMC. I get lucky!''' - ''Joseph 2000''|6uI2emtskdU|'''M3 75 mm GMC, American, Tier-1 Tank Destroyer''' - ''Angry Nerd Gaming''}}
 +
 
 +
== See also ==
 +
<!-- ''Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:''
 
* ''reference to the series of the vehicles;''
 
* ''reference to the series of the vehicles;''
−
* ''links to approximate analogues of other nations and research trees.''
+
* ''links to approximate analogues of other nations and research trees.'' -->
−
''ETC.''
+
 
 +
;Other vehicles of similar configuration and role
 +
 
 +
* [[Sd.Kfz.251/10]]
 +
* [[Sd.Kfz.251/22]]
 +
* [[SU-57]]
  
−
== Sources ==
+
== External links ==
−
''Paste links to sources and external resources, such as:''
+
<!-- ''Paste links to sources and external resources, such as:''
 
* ''topic on the official game forum;''
 
* ''topic on the official game forum;''
−
* ''page on the Wikipedia;''
+
* ''other literature.'' -->
−
* ''other literature.''
+
 
 +
* [[wt:en/devblog/current/764/|[Devblog] M3 75 mm GMC and Ki-21-1ko]]
 +
* [[wikipedia:M3_Gun_Motor_Carriage|[Wikipedia] M3 Gun Motor Carriage]]
 +
* [https://tanks-encyclopedia.com/ww2/US/M3_Halftrack.php <nowiki>[Tanks Encyclopedia]</nowiki> Half Track Car M3]
 +
 
 +
{{USA tank destroyers}}
 +
[[Category:Half-tracks]]

Latest revision as of 16:51, 24 November 2023

Rank VII | Premium | Golden Eagles
Challenger DS Pack
This page is about the American tank destroyer M3 GMC. For other half-track vehicles based on the M3, see M3 Half-Track (Family). For other uses, see M3 (Disambiguation).
M3 GMC
us_halftrack_m3_75mm_gmc.png
GarageImage M3 GMC.jpg
ArtImage M3 GMC.png
M3 GMC
USA flag.png USA
I Rank
Battle rating:
AB RB SB
1.7 1.7 1.7
Class:
Research:5 900 Specs-Card-Exp.png
Purchase:6 300 Specs-Card-Lion.png
Show in game

Description

When the German Wehrmacht overrun France in 1940, the US Army began to re-evaluate their anti-tank strategy and inventory to face the Panzer Divisions. The result was the Tank Destroyer Branch in 1941 with its own dedicated tank destroyer vehicles to destroy German tanks. The urgency of setting up the branch caused the first vehicles to be more akin of an improvised weapon, resulting in the M3 Gun Motor Carriage (GMC), which consisted of a M3 half-track with a French 75 mm cannon installed on top. Despite the slapdash construction, the vehicle was approved for service and up to 2,200 were produced between 1941 to 1943, seeing combat in both the Pacific, North Africa, and Italian theaters. The M3 GMC would be slowly be replaced by the more powerful M10 GMC, equipped with the larger 3-inch M7 gun.

The M3 GMC was introduced in Update 1.49 "Weapons of Victory" as an American tank destroyer. The half-track construction does not inspire confidence in the vehicle's survivability, but the 75 mm gun packs a punch at its rank placement. However, the 75 mm gun suffers from a prolonged reload time, requiring users to make careful shot placements and make sure they have tactics to stay safe during the reload time. The M3 GMC can be a complicated tank destroyer to play with its vulnerabilities, but can enable players to bring to battle a large gun capable of decimating the opponent it hits, a good weapon to bring against the occasional medium or heavy tanks that could be seen in Rank I battles.

General info

Survivability and armour

Armourfront / side / back
Hull6 / 6 / 6
Turret12 / 12 / 0
Crew5 people
Visibility88 %

Just about any enemy is deadly to the 75 mm GMC M3, as the armour will only stop small-calibre machine gun rounds. Every tank cannon will penetrate the armour. Vehicles with autocannons or heavy machines guns are often the deadliest for the crew, especially strafing aircraft. The vehicle can also be easily destroyed by overpressure: HE shells and artillery strikes are thus very dangerous.

Armour type:

  • Rolled homogeneous armour
  • Structural steel (back side)
Armour Front Sides Rear Roof
Hull 6.35 mm (31°) 6.35 mm 6.35 mm N/A
Turret (Gun shield) 12.7 mm 12.7 mm N/A 12.7 mm

Notes:

  • Tracks are 7 mm thick.
  • Road wheels are 2 mm of rubber.
  • Structural chassis thickness is 15 mm throughout.

Mobility

Speedforward / back
AB83 / 19 km/h
RB and SB76 / 18 km/h
Number of gears8 forward
2 back
Weight9.1 t
Engine power
AB282 hp
RB and SB148 hp
Power-to-weight ratio
AB31.0 hp/t
RB and SB16.3 hp/t
Game Mode Max Speed (km/h) Weight (tons) Engine power (horsepower) Power-to-weight ratio (hp/ton)
Forward Reverse Stock Upgraded Stock Upgraded
Arcade 83 19 9.1 210 282 23.08 30.99
Realistic 76 18 131 148 14.4 16.26

Modifications and economy

Repair costBasic → Reference
AB298 → 368 Sl icon.png
RB332 → 410 Sl icon.png
SB400 → 494 Sl icon.png
Total cost of modifications5 970 Rp icon.png
4 480 Sl icon.png
Talisman cost410 Ge icon.png
Crew training1 800 Sl icon.png
Experts6 300 Sl icon.png
Aces75 Ge icon.png
Research Aces135 000 Rp icon.png
Reward for battleAB / RB / SB
20 / 30 / 40 % Sl icon.png
106 / 106 / 106 % Rp icon.png
Modifications
Mobility Protection Firepower
Mods new tank traks.png
Tracks
Research:
400 Rp icon.png
Cost:
300 Sl icon.png
70 Ge icon.png
Mods new tank suspension.png
Suspension
Research:
270 Rp icon.png
Cost:
200 Sl icon.png
50 Ge icon.png
Mods new tank break.png
Brake System
Research:
270 Rp icon.png
Cost:
200 Sl icon.png
50 Ge icon.png
Mods new tank filter.png
Filters
Research:
500 Rp icon.png
Cost:
380 Sl icon.png
90 Ge icon.png
Mods new tank transmission.png
Transmission
Research:
640 Rp icon.png
Cost:
480 Sl icon.png
115 Ge icon.png
Mods new tank engine.png
Engine
Research:
640 Rp icon.png
Cost:
480 Sl icon.png
115 Ge icon.png
Mods tank tool kit.png
Improved Parts
Research:
400 Rp icon.png
Cost:
300 Sl icon.png
70 Ge icon.png
Mods extinguisher.png
Improved FPE
Research:
270 Rp icon.png
Cost:
200 Sl icon.png
50 Ge icon.png
Mods tank reinforcement us.png
Crew Replenishment
Research:
500 Rp icon.png
Cost:
380 Sl icon.png
90 Ge icon.png
Mods new tank horizontal aiming.png
Horizontal Drive
Research:
400 Rp icon.png
Cost:
300 Sl icon.png
70 Ge icon.png
Mods tank cannon.png
Adjustment of Fire
Research:
270 Rp icon.png
Cost:
200 Sl icon.png
50 Ge icon.png
Mods tank ammo.png
75mm_usa_APCBC_ammo_pack
Research:
270 Rp icon.png
Cost:
200 Sl icon.png
50 Ge icon.png
Mods new tank vertical aiming.png
Elevation Mechanism
Research:
500 Rp icon.png
Cost:
380 Sl icon.png
90 Ge icon.png
Mods tank ammo.png
75mm_us_M89_Smoke_ammo_pack
Research:
640 Rp icon.png
Cost:
480 Sl icon.png
115 Ge icon.png

As with all tanks, Parts and FPE should be your first priority. After that you may want to pick up the M61 shot for an overall much more lethal round, with better penetration and some explosive filler. Beyond that, crew replenishment should be a priority; how you get there is personal preference between mobility improvements or gun handling. Both paths have merit, but seeing as the role of the M3 is more of a longer range support vehicle, gun handling would likely provide a greater benefit for most players.

Armaments

Main armament

75 mm M1897A4 cannon
Ammunition60 rounds
Reloadbasic crew → aces
7.8 → 6.0 s
Vertical guidance-10° / 29°
Horizontal guidance-19° / 21°
Main article: M1897A4 (75 mm)
75 mm M1897A4 Turret rotation speed (°/s) Reloading rate (seconds)
Mode Capacity Vertical Horizontal Stabilizer Stock Upgraded Full Expert Aced Stock Full Expert Aced
Arcade 60 -10°/+29° -19°/+21° N/A 5.3 7.3 8.9 9.8 10.5 7.80 6.90 6.36 6.00
Realistic 3.6 4.2 5.1 5.6 6.0

Ammunition

Penetration statistics
Ammunition Type of
warhead 		Penetration @ 0° Angle of Attack (mm)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 m
M72 shot AP 89 86 76 65 56 48
M48 shell HE 11 11 10 10 10 10
M61 shot APCBC 102 100 91 82 74 66
Shell details
Ammunition Type of
warhead 		Velocity
(m/s) 		Projectile
mass (kg) 		Fuse delay
(m) 		Fuse sensitivity
(mm) 		Explosive mass
(TNT equivalent) (g) 		Ricochet
0% 50% 100%
M72 shot AP 609 6.3 - - - 47° 60° 65°
M48 shell HE 594 6.3 0.2 0.1 666 79° 80° 81°
M61 shot APCBC 609 6.79 1.2 14 63.7 48° 63° 71°
Smoke shell characteristics
Ammunition Velocity
(m/s) 		Projectile
mass (kg) 		Screen radius
(m) 		Screen deploy
time (s) 		Screen hold
time (s) 		Explosive mass
(TNT equivalent) (g)
M89 259 3 9 5 20 50

Ammo racks

Ammo racks of the M3 GMC
Full
ammo 		1st
rack empty 		2nd
rack empty 		Visual
discrepancy
60 31 (+29) 1 (+59) Yes

Usage in battles

The 75 mm GMC M3 cannot go toe-to-toe with other tanks due to the lack of protection for the crew and insufficient armour layout. The armour can only stop rifle-calibre rounds from machine guns, and could possibly deflect 12.7 mm rounds off the frontal arc, but this vehicle was never designed to fight other tanks head-to-head. Its playstyle may generally confuse new or inexperienced players, as they would bring the vehicle up close to the front.

The vehicle was mainly purposed for destroying tanks at a distance, hence the amazing penetration values with the gun at its battle rating. It will still penetrate tanks of its BR and rank even at 500 m, which means staying from afar is the best way to play this particular vehicle. However, relocating after successive shots is another good idea. It prevents returning fire from the enemy, especially artillery strikes. It is not wise to bring this vehicle upfront, as it will probably not survive long with rigorous combat. However, the M3 GMC can be quite deadly up close as well if it manages to take the enemy by surprise. If planning to go up front, stock up on the M61 shot, which will increase the gun's lethality to tanks due to its internal HE charge. Keep in mind that this vehicle has to be supported by teammates, experienced players will take note of it's long to reload and may try to rush out and destroy the M3 GMC during the reloads. Effective use of its excellent reverse speed to take cover or back out of enemy fire will increase the chances of surviving. Overall, this vehicle is an effective tank destroyer for its rank, rivalling the ZiS-30. It combines the penetration ability of the ZiS-30 on to a larger calibre weapon, at the same time marrying the weapon on to the M3 half-track, which is already blessed with exceptional mobility.

The low fire rate can be a fatal downfall for many newer players; always stay in cover while reloading. Many players will stay out in the open while they wait for the gun to reload; this is a deadly mistake.

Pros and cons

Pros:

  • Powerful cannon for its rank
  • Good mobility
  • Post-penetration damage of the M61 shot is deadly
  • Exceptional reverse speed
  • Acceleration is best when compared to other tank destroyers of its rank
  • Two spare crew members before efficiency is compromised

Cons:

  • New players may find the large turn radius of this vehicle very hard to use
  • Lightly armoured, will only withstand 7.92 mm rounds effectively
  • Any cannon round will penetrate this vehicle anywhere
  • Vulnerable to strafing aircraft
  • Entire crew is exposed, can be incapacitated by overpressure (HE shells, artillery strikes)
  • Commander and loader are in-line with each other when viewing from the front, and same for the driver and gunner
  • Poor reload time, slower than most other cannons at the rank
  • Stock AP shell has poor post-penetration damage
  • Limited traverse and slow traverse speed for the cannon

History

Development

In the opening stages of World War II, the American military leaders realize they did not have any adequate anti-tank weaponry to repel a German tank assault. An urgent request for one developed into something akin of an improvised weapon.

A 75 mm GMC M3.

Army development took an M3 half-track and placed the French 75 mm Gun M1897A4 gun onto it with a huge gun shield to protect the crew. This experimental vehicle was called the T12, and was deemed to work well enough to be adopted and standardized in October 1941 as the 75 mm GMC M3. From 1941 to 1943, about 2,200 units were produced, but many were converted back to standard half-tracks before they got issued, so it resulted in only about 842 units seeing combat service.

The M3 GMC was not particularly a protected vehicle given that it used a half-track as its basis, giving it rather limited protection for the crew. The gun crew on the half-track has a huge gun shield to take cover behind as they ready the weapon, but the truck driver and passenger would have no protection available. The French 75 mm Gun M1897A4 attached was a multi-purpose artillery piece, it could fire an armour piercing shell that could penetrate 81 mm of armour at 500 yards in a direct-fire role, and could hit targets up to 9,200 yards in an indirect-fire role. The 75 mm gun could only traverse in a limited arc forward, unable to traverse to face the back. Nevertheless, for a rushed production, the vehicle was deemed acceptable for use.

Combat service

A 75 mm M3 GMC in British service firing in an artillery role in the Italian theater.

The vehicles saw service first in the Philippines when the Japanese invaded in December 1942, used to fend off Japanese vehicles and infantry. When the Japanese conquered the Philippines, they captured the 75 mm GMC M3s and used them against U.S. Forces when they invaded the Philippines in October 1944. The largest concentration of the 75 mm GMC M3 was in the North African Campaign, and then again in the Sicilian Campaign. During the Sicilian campaign, it was gradually phased out for the 3-inch Gun Motor Carriage M10 as it was starting to become obsolete, but it stayed as a support weapon as assault guns for special forces. In the Pacific, they saw further use in the Marine Corps blasting Japanese tanks and fortifications on the major island battles before being gradually replaced by the 105 mm artillery on the M7 Priest.

The British, French, and Philippine Army were the few Allies who got their hands on the 75 mm GMC M3. In British terminology, it was known as the 75 mm SP, Autocar. The Free French forces used some M3 GMC in the Western Front during the invasion of France. The Philippine forces used the M3 GMC when the U.S. supplied their military there with it. The Philippines retained the M3 GMC up to the 1960s, being used by a number of factions, from the Japanese when they captured it in the 1940s, the rebels of the Hukbalahap Rebellion, and in the Korean War by the Philippine Expeditionary Force.


Archive of the in-game description

This self-propelled artillery installation was built in 1941 on the base of the M3 semitrack transporter by installing a modified version of an old French cannon onto it. It was released right up until 1943 and was unsuccessful as an anti-tank vehicle due to its poor armament and minimal armour.


Media

Skins
Videos
Talisman Series (Tanks) M3 GMC. I get lucky! - Joseph 2000
M3 75 mm GMC, American, Tier-1 Tank Destroyer - Angry Nerd Gaming

See also

Other vehicles of similar configuration and role

External links


USA tank destroyers
M10  M10 GMC
M36  M36 GMC · M36B2
T95  T28 · T95
M109  M109A1
ATGM  LOSAT · M901
Wheeled  M3 GMC · T55E1
Other  M8 HMC · M50 · M56
China  ▃LVT(A)(4) (ZIS-2)

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