ELLSWORTH AFB, S.D. – Tech. Sgt. Joseph Wengler, 28th Security Forces Squadron flight chief, fires an M-4 rifle at a target, Nov. 9. Sergeant Wengler prepares for the Global Strike Challenge where he and his teammates will be tested on tactical movements, firing skills and security knowledge. The challenge pits missile and bomb crews, security forces, and maintainers from five Air Force Bases in head-to-head competitions as each seek to be recognized as the “best of the best.” (U.S. Air Force photo/Senior Airman Kasey Close)