Senior Airman Marquez Roquemore, 4th Security Forces Squadron patrolman, competes in a ruck march with fellow defenders, July 30, 2018, at Seymour Johnson Air Force Base, North Carolina. Five security forces Airmen completed a four-mile ruck march for time as part of the 4th SFS Defender Challenge trial to compete for a spot in the Defender Challenge in Joint Base San Antonio-Camp Bullis, Texas. (U.S. Air Force photo by Airman 1st Class Shawna L. Keyes)