U.S. Air Force Senior Airman Aaron Lee, 9th Security Forces Squadron patrolman, clears a building during Air Combat Command’s Defender Challenge team selection at Joint Base Langley-Eustis, Virginia, August 21, 2018. The six Airmen that are selected to represent ACC, will test their skills in realistic weapons scenarios, simulated dismounted operations and combat endurance events during the 2018 Air Force Defender Challenge. (U.S. Air Force photo by Airman 1st Class Anthony Nin Leclerec)