sentences:  In 2008, work began on plans to reach the level of nearly 160,000 tracking systems in the US Army within a few years; the system prime contractor is the Northrop Grumman corporation of Los Angeles, California.The M1A1 Abrams's tank AIM refurbishment/upgrade program includes Force XXI Battle Command Brigade and Below (FBCB2) and Blue Force Tracking.In November 2010 the United States Army and the United States Marines Corps reached an agreement to standardize on a shared system, to be called "Joint Battle Command Platform", which will be derived from the Army's FBCB2 system that was used by the United States Army, the United States Marines Corps, and the British Army during heavy combat operations in Iraq in 2003.