A hand is imprinted on a ladder rung at the Alpha Warrior Air Force Tour competition battle rig at Shaw Air Force Base, S.C., Aug. 2, 2017. The rig gave service members an opportunity to put their strength to the test through a series of obstacles including: a salmon ladder, which is an obstacle that consists of maneuvering a steel bar upward through five rungs, swinging monkey bars and an inverted ladder climb known as the devil steps. (U.S. Air Force photo by Senior Airman Christopher Maldonado)