The M1A2 SEP (System Enhancement Package) is an upgraded M1A2 Abrams. Its most significant upgrades is the better thermal sights for not only the gunner and commander, but also the driver as well who previously only had access to night vision devices. Another difference of the M1A2 SEP from previous Abrams is the TUSK (Tank Urban Survival Kit) modification, which adds explosive reactive armour on the tank sides to protect against chemical warheads.