Extensive improvements have been implemented to the latest M1A2C and D (formerly designated M1A2 System Enhancement Package version 3 or SEPv3 and M1A2 SEPv4, respectively) versions such as improved composite armor, better optics, digital systems and ammunition. Efforts to develop an M1A3 version were first publicly disclosed in 2009. There are three main operational Abrams versions, the M1, M1A1, and M1A2, with each new iteration seeing improvements in armament, protection, and electronics. The M1 Abrams was developed from the failure of the MBT-70 project to replace the obsolescent M60 Patton. Initial models of the M1 were armed with a licensed-produced 105 mm Royal Ordnance L7 gun, while later variants feature a licensed Rheinmetall 120 mm L/44. Conceived for modern armored ground warfare and now one of the heaviest tanks in service at nearly 68 short tons (almost 62 metric tons), it introduced several innovative features, including a multifuel turbine engine, sophisticated Chobham composite armor, a computer fire control system, separate ammunition storage in a blow-out compartment, and NBC protection for crew safety. The M1 Abrams is a third-generation American main battle tank designed by Chrysler Defense (now General Dynamics Land Systems). M829A4 APFSDS, M830A1 HEAT, M1028 Canister, M240C, Repair tool

Thanks to Comrade Volkov for his epic screenshots!(pic2)

Project LETMS now has a discord server, which you can join here

M1a2 abrams driver compartment