The M1E3 Abrams prototype, the latest tank in the Army's lineup, is so new and under wraps that there aren't official photos of it yet, but here's what we know.

Key Points and Summary - The U.S. Army has canceled its planned M1A2 SEPv4 tank upgrade, a program that would have pushed the Abrams to a "too heavy" 80 tons, after a damning Army Science Board report ...