Soldiers assigned to 3rd Battalion, 21st Infantry Regiment participate in a Combined Arms Live Fire Exercise as part of the U.S. Army Alaska-led Joint Force Land Component Command in support of Alaskan Command's exercise Arctic Edge 18 at Ft. Greely, Alaska, March 15, 2018. Arctic Edge 2018 is a biennial, large-scale, joint-training exercise that prepares and tests the U.S. military’s ability to operate tactically in extreme cold-weather conditions found in Arctic environments. (U.S. Air Force by Tech. Sgt. Efren Lopez)