#152mm

As the M60 was coming into service, development started to create an ATGM armament for the tank to put it into service by 1965, which would lead to the 152mm gun/launcher system being mounted on a uniquely designed turret (Type B) on top of the M60 hull; however, the US Army's dream of a simple transition into the weapon system was trashed when complications with the system arose, especially in regards to the sensitive ammunition. While a limited production run was allowed with the tank designated as the M60A2, continued trouble with the tank led to the M60A2's phasing out, with only 526 units produced.

The XM803 stands as a daring experiment in American tank design, conceived from the ambitious MBT-70 program. Initially envisioned as a next-generation main battle tank to replace the aging M60 family, the XM803 was engineered to combine overwhelming firepower with exceptional mobility. Outfitted with a cutting-edge 152 mm XM150E6 gun/launcher, advanced targeting systems, and a two-plane gun stabilizer paired with an autoloader, it promised to redefine battlefield engagement. Yet, in its quest to balance performance and cost, the XM803 sacrificed armor protection and crew survivability making it a high risk, high reward vehicle that rewards skilled, hit-and-run tactics with its incredible mobility and firepower.