To put that in perspective, during the height of active battle operations in Iraq, US soldiers used 5.5 million rounds of ammunition a month. Extrapolating the figures, the DHS has purchased enough bullets over the last 10 months to wage a full scale war for almost 30 years.
http://www.infowars.com/dhs-purchases-21-6-million-more-rounds-of-ammunition/
So are they just trying to keep the suppliers so busy there isn't anything left over for the public??