Senior Airman Nathaniel Williams, joined by Officer William Broach, right, shouts for Master Sgt. Sloan Kalina to back up to the sound of his voice during a quality control exercise on Joint Base Charleston, S.C., July 28, 2010. The role play scenario was used to qualify security forces Airmen for patrol. Sergeant Kalina, Airman Williams and Officer Broach are assigned to the 628th Security Forces Squadron. (U.S. Air Force Photo/Airman 1st Class Lauren Main)

Senior Airman Nathaniel Williams handcuffs and searches Master Sgt. Sloan Kalina during a quality control exercise on Joint Base Charleston, S.C., July 28, 2010. The scenario given to Airman Williams consisted of an individual speeding past a gate checkpoint onto the base with a concealed weapon. Airman Williams was given a description of the vehicle and the general direction it was heading. In order to obtain his qualification, he had to locate the vehicle and provide a thorough search of the suspect inside. Airman Williams and Sergeant Kalina are both with the 628th Security Forces Squadron. (U.S. Air Force Photo/Airman 1st Class Lauren Main)

Senior Airman Nathaniel Williams searches Master Sgt. Sloan Kalina and passes an item of suspicion to Officer William Broach during a quality control exercise on Joint Base Charleston, S.C., July 28, 2010. The quality control check is comprised of numerous aspects which include a written test, a verbal exam, subject matter test, weapons training and a scenario for security forces Airmen to respond to. Sergeant Kalina, Airman Williams and Officer Broach are assigned to the 628th Security Forces Squadron. (U.S. Air Force Photo/Airman 1st Class Lauren Main)

Senior Airman Nathaniel Williams handcuffs Master Sgt. Sloan Kalina during a quality control exercise on Joint Base Charleston, S.C., July 28, 2010. The scenario consisted of a gate runner with a concealed weapon. The exercise was conducted to test the skills of security forces Airmen tasked with apprehending the suspect. Airman Williams and Sergeant Kalina are both with the 628th Security Forces Squadron. (U.S. Air Force Photo/Airman 1st Class Lauren Main)