The M939 series 5-tonne 6x6 truck is a family of United States Army logistical transportation Trucks which was designed in the late 1980s and has been in service through the current day. About 32,000 M939 series trucks are in service. The M939 series is an improved version of the older M809 Truck series of trucks.*************The United States Army is the largest branch of the armed forces of the United States. Like all armies, it has the primary responsibility for land-based military operations. The modern Army had its roots in the Continental Army which was formed on June 14, 1775, before the establishment of the United States, to meet the demands of the American Revolutionary War. Congress created the United States Army on June 3, 1784 after the end of the war to replace the disbanded Continental Army. The Army considers itself to be descended from the Continental Army, and thus dates its inception from the origins of that force.