U.S. Air Force Staff Sgt. Ryan Santiago, U.S. Air Forces

U.S. Air Force Staff Sgt. Ryan Santiago, U.S. Air Forces in Europe team, competes in a combat endurance competion during Air Force Defender Challenge Sept. 13, 2018 at Joint Base San Antonio-Camp Bullis, Texas. Fourteen Security Forces teams from U.S. Air Force major commands, United Kingdom and Germany test their skills in realistic weapons scenarios, simulated dismounted operations and grueling combat endurance events as part of Air Force Defender Challenge. The team with the most combined points wins the coveted Defender Challenge Championship Trophy. (U.S. Air Force photo by Sarayuth Pinthong)