U.S. Air Force Staff Sgt. Dillon Willis, 28th Civil Engineer Squadron explosive ordnance disposal technician, performs a low crawl during the Prime Base Engineer Emergency Force, also referred to as BEEF, Challenge at Ellsworth Air Force Base, S.D. Sept. 22, 2022. The Prime BEEF Challenge is a physical and mental readiness challenge that tests every engineer’s capability to operate while under extreme stress. A Prime BEEF Combat Engineers mission is to be able to enter any space within an area of responsibility and recover an airfield, re-establish infrastructure, and establish air power wherever they are assigned. (U.S. Air Force Photo by Airman Yendi Borjas)