U.S. Air Force Airmen assigned to the 644th Combat Communications Squadron, stand guard at an entry control point during a field training exercise on North West Field, Guam, April 22, 2021. Students were tested on the skills and knowledge they gained over the past several weeks during exercise Dragon Forge. Exercise DF is a combat skills training course that prepares participants to deploy to austere locations. (U.S. Air Force photo by Senior Airman Helena Owens)
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