VANDENBERG AIR FORCE BASE, Calif. -- A UH-1N helicopter lands to recover a payload of 21st Space Wing Security Forces team members during the security forces tactics competition for Guardian Challenge here May 4. Guardian Challenge, the world's premier space and missile competition, is a four-day event held annually. It tests the wartime readiness of Air Force Space Command's Airmen in spacelift, ICBM operations, communications, maintenance, helicopter operations, security forces and chef food preparation. (U.S. Air Force photo by Airman 1st Class Edmund Gibbons III)