Interestingly enough, the US has the largest air force in the world (the US Air Force), the second largest air force in the world (the planes flown by the US Army), the fourth largest air force in the world (the Navy) and the seventh largest (the Marines).

In what world is it rational for one country to have four different air forces?

America spends more on weapons than the next ten countries put together - what are you so frightened of?