U.S. Air Force Senior Airman Anthony Fernandez, 355th Communications Squadron network technician, provides cover for Senior Airman Mark Lindsay, 355th CS network technician, who is carrying a simulated hostage to safety during the Comprehensive Airman Fitness Month Defender Challenge held by the 355th Security Forces Squadron at Davis-Monthan Air Force Base, March 31, 2016. The challenge simulated a hostage recovery scenario using non-lethal training ammunition to replicate armed combat between opposing forces. (U.S. Air Force photo by Airman Nathan H. Barbour/Released)