Students participating in the Air Force Phoenix Raven Class at Fort Dix, N.J., do warm-up jumping jacks prior to a training session, March 27, 2006. The students, who include Air Force security forces and U.S. Navy personnel, receive training in everything from combat first aid and tactical self defense to aircraft security, as well as undergo extensive physical training. U.S. Air Force photo by Tech. Sgt. Scott T. Sturkol