US Air Force (USAF) Security Police (SP) assigned to the 310th Space Group (SG) "Bombardiers" armed with 5.56mm M16A2 rifles carry a practice dummy during a simulated prisoner of war exercise at Vandenberg Air Force Base (AFB) California (CA), during Exercise GUARDIAN CHALLENGE 2002. Guardian Challenge, a four-day space and missile competition, is hosted annually at Vandenberg AFB, CA to test the wartime readiness of Air Force Space Command (AFSPC) professionals