U.S. Air Force Airman 1st Class Matthew Elliot, a 773d Civil Engineer Squadron water and fuel systems maintenance technician, assembles his M4 carbine during Prime Base Engineer Emergency Force Day on Joint Base Elmendorf-Richardson, Alaska, Sept. 24, 2021. Prime BEEF Day is a monthly training day hosted to allow 773d CES Airmen to hone their skills and stay up-to-date on necessary training courses. (U.S. Air Force photo by Airman 1st Class Patrick Sullivan)