What he's trying to do is weaken our military both by downsizing its capabilities and making people not want to join it, and also by filling it up with fag tinkerbells who would rather screw the enemy than kill them and don't have the nation's best interest at heart. This is Hussein's contribution to the global jihad, to destroy the U.S. military from within so the U.S. will be easily taken over by his Muslim brothers.
I really don't think Obama wants a weakened U.S. military, but he definitely wants to use the military for his own purposes.
So Obama has to get rid of this elements of the military that would most be likely to refuse to carry out his orders such as devoutly religious people, and fill the ranks will people more likely to be loyal to him.
Also all future militaries will rely less on human beings, and more on robots such as UAV's.