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: General Dynamics' AbramsX technology demonstrator presents a vision for modernizing the M1 Abrams tank with features like a lighter chassis, hybrid engine, unmanned turret, autoloader, ...

Traditionally, tanks are seen as being at an inherent disadvantage in urban combat. In the 21st Century, however, the U.S. military must be prepared for urban combat in large, densely populated cities ...