The President is the military Commander-in-Chief of the Armed Forces, while the Secretary of Defense has administrative authority over them. The total active manpower is about 1,362,000 active duty, plus 1,277,000 Reserve and National Guard. There is none conscription, all volunteer forces.
The total land forces power is about 525,000 active duty, plus 332,000 Army National Guard and 556,000 selected reserves.
The Army structure is three types of headquarters : Army Commands, Army Service Component Commands, Army Service Component Commands, and Direct Reporting Units.
The three Army Commands are US Army Forces Command, US Army Training and Doctrine Command, and US Army Materiel Command.

Military equipment and vehicle Unites States Army of America.