Too many armed people.

total guns in the US 223,000,000

^ "Bureau of Justice Statistics Selected Findings". http://www.ojp.usdoj.gov/bjs/pub/pdf/guic.pdf. Retrieved 2008-01-21.



Total US armed forces 3,385,400

http://en.wikipedia.org/wiki/List_of_countries_by_number_of_active_troops