Background
The M1 Abrams, named for former General Creighton Abrams (commanded US troops in Vietnam following General Westmoreland, and later became US Army Chief of Staff), is the current front line Main Battle Tank of the US Army and US Marine Corps. It also serves in the Armed Forces of nations such as Australia, Egypt, Iraq, and Saudi Arabia. It first entered service with US forces in 1980 and has over the years since been upgraded with various enhancements, especially as battle conditions in which it finds itself have changed from a tank vs tank to “urban combat” situations.