press space to view each variant. all have different barrel markings and division markers M1A2 is base model (commander is john) M1A2 SEP V3 gets the Israeli Trophy APS system (also on merkava and leo 2a8) that is battle tested and shoots down rpgs and missiles (commander is smith) M1A2 SEP V3 + ARAT gets ERA on the sides of the tank (commander is rodriguez) M1A2 ARAT, only ERA no aps (commander is lee) M1A1 (ERA), just an m1a1 with era (commander is gary) M1A1, same tank from before but without ERA (same guy from before too)
yes the barrel art + nicknames are halo references many improvements compared to the old model including more details, better crewman model, identification panels, division markings, more stuff in the bustle rack, barrel nicknames, detailed drive sprockets (the first and last "wheel" on the tracks) and an overall better turret shape the 2 m1a1 variants are the same guy btw