U.S. Air Force Senior Airman Aaron Lee, 9th Security Forces Squadron patrolman, and Airman 1st Class Jacob D’Agostino, 633rd Security Forces Squadron response force leader, clear a building during Air Combat Command’s Defender Challenge team selection at Joint Base Langley-Eustis, Virginia, August 20, 2018. The Airmen competed to represent ACC during the 2018 Air Force Defender Challenge, which will be held at Joint Base San Antonio-Camp Bullis, Texas, from Sept. 10-13, 2018. (U.S. Air Force photo by Airman 1st Class Anthony Nin Leclerec)