"The electronics on the M-1 have undergone several upgrades so far
"A major enhancement was depleted uranium armor, which made the M-1 virtually invulnerable from the front.
"One threat [of new anti-tank weapons] that is currently ignored is top attack warheads (that put a shape charge type attack against the thin top armor).
Note:
(a) M1A2SEP (System Enhancement Package) is the latest standard.
(b) Abrams Tank (M1A2) System Enhancement Program (SEP); Army Programs. The Office of Director, Operational Test & Evaluation (DOT & E), Offie of the Secretary of Defense, undated. http://www.dote.osd.mil/pub/repo ... 02AbramsM1A2SEP.pdf