Obviously the ammunition is purchased very much in bulk, but let's say, I dunno, $0.05/round? (I pay around $0.25 or more for .45ACP for a handgun.) Carry the one...$1250/week just in ammo.

$0.25/rd is a fair price for 9mm or 5.56mm. However, it is 25000 rounds per week. $6250/wk. Plus a bunch of other costs far exceeding the ammo costs. I don't think the 150k rounds round count is reasonable, unless a lot of that is fired from something other than individual weapons used by the servicemember.