The United States military is one of the largest by number. The manpower of the US Army comes from the large number of volunteers who served, although the draft policy was used many times in the past, both during wartime and peacetime, but it has not been used since. 1972.
As of 2010, the United States spends approximately US $ 692 billion annually to finance its military forces, accounting for about 42 percent of world military spending. Collectively, the armed forces of the United States possess a large number of powerful and advanced equipment that give them a great deal of both defense and attack capabilities.