
This is the government's official expanation:
"The bullets are for Social Security's office of inspector general, which has about 295 agents who investigate Social Security fraud and other crimes, said Jonathan L. Lasher, the agency's assistant IG for external relations.
The agents carry guns and make arrests — 589 last year, Lasher said. They execute search warrants and respond to threats against Social Security offices, employees and customers."
http://news.yahoo.com/why-does-social-s ... 10918.html