Airmen assigned to the 28th Civil Engineer Squadron rush over to complete a litter carry with a training dummy during the Prime Base Engineer Emergency Force (BEEF) challenge at Ellsworth Air Force Base, S.D., Aug. 17, 2017. Prime BEEF was created to put Airmen to the test and see how they perform in a competitive environment. (U.S. Air Force photo by Airman 1st Class Donald C. Knechtel)