Airmen from the 28th Civil Engineering Squadron treat a simulated injury during the Prime Base Engineer Emergency Force (BEEF) Challenge on Ellsworth Air Force Base, S.D., June 11, 2021. During the challenge’s self-aid buddy care event, engineers ran 50 yards into an unknown location with multiple obstacles in order to move simulated casualties to a collection point and perform lifesaving protocols. (U.S. Air Force photo by Airman 1st Class Quentin K. Marx)