JOINT BASE LEWIS-MCCHORD, Wash. -- Staff Sgt. Karl Renfro, 446th Logistics Readiness Flight, demonstrates proper form situps, and proper wear of the Air Force PT uniform during a fitness assessment here July 10, 2010. Notice the tucked in shirt, and white socks with conservative running shoes. Reservists are encouraged to familiarize themselves with proper wear guidelines. (U.S. Air Force photo/Staff Sgt. Grant Saylor)