Maj. Heidi Shelstad, 823rd Base Defense Squadron (BDS) physician assistant, debriefs a squad from the 824th BDS after completing an advanced combat casualty care (AC3) training scenario, May 7, 2020 at Moody Air Force Base, Ga. AC3 is necessary training for the 824th BDS before it begins its cycle on the Immediate Response Force. (U.S. Air Force photo by 1st Lt. Faith Brodkorb)