History
The M1 Abrams tank has been in service since 1980. Since that time, it has been upgraded with multiple improvements. The first M1's where fitted with the 105mm rifle gun. An upgrade to the 120mm smoothbore gun resulted in the M1A1 in 1985. By 1992, the M1A2 was produced that possessed upgrades in its optical, fire control, and data link systems. The end of the Cold War meant new M1A2 production was halted at just 62 tanks, but 566 existing M1A2s were upgraded to the M1A2 standard between 1994 and 2001. Upgrades continued after 2001 with the M1A2 SEP (Systems Enhancement Package).