U.S. Air Force Master Sgt. Amanda Hass, 355th Civil Engineer Squadron first sergeant, performs a hand-entry render-safe procedure on a simulated explosive device during the Comprehensive Airman Fitness Month Fire Department Fitness Challenge at Davis-Monthan Air Force Base, Ariz., March 31, 2016. The 355th Civil Engineer Squadron’s explosive ordnance disposal and fire emergency service flights held the event to challenge the mental and physical resilience of Airmen. (U.S. Air Force photo by Airman 1st Class Mya M. Crosby/Released)