U.S. Airmen assigned to the 20th Operations Group test their self-aid buddy care knowledge on a mannequin during a Warrior Day commander’s challenge at Shaw Air Force Base, S.C., Sept. 29, 2017. Medical Airmen placed the team under pressure by surrounding them with the sounds of simulated cannon and gun fire. (U.S. Air Force photo by Airman 1st Class Kathryn R.C. Reaves)