My memory may be failing me, but I recall needing some humanitarian supplies in Iraq in 2007 (basically, rice, blankets, mattresses, and halal meals) on a few occasions and I think (though I am not sure) that our Civil Affairs personnel requested those items through USAID (or some NGO). My understanding is that we used USAID / some NGO because the Army did not have a stockpile available nor could we obtain it quickly enough through whatever channels that stuff comes through.