Simply to please the ego of a megalomaniac fascist moron to the tune of $22M. If Right-wingers needed any more proof of what the Left has been saying all along, then they are too damn stupid to talk to like they are actual thinking adults. Their fearless leader, General Deferment or Corporal Bone-spur certainly isn't. Geesh!!
I prefer "cadet Bone Spur" as more historically accurate, though the connotation of "corporal" is tempting given its association with Hitler. The Comb-Over in Chief did tell the country that he was "the most militaristic person there is," and plenty of dingbats thought that sounded good. I don't think that it's likely those same dingbats have any problem with his desire for the military of the US to reinforce his narcissism.