9) Did you know that U.S has by far the largest number of aircraft carrier groups in the world, which projects U.S power across the oceans of the world and allows it to rapidly deploy firepower to various regions of the globe quickly and forcefully? This definitely deserves to be on our list of military spending facts that will blow your mind. The U.S has 10 aircraft carries in service today, which are used both for power projection as well as defense.