Senior Airman Benjamin Oviedo, 811th Security Forces Squadron executive aircraft security team member, disassembles a M240B machine gun as part of a security forces defender competition on Joint Base Andrews, Md., July 23, 2018. Oviedo, along with other defenders, performed drills, exercises and displayed weapon knowledge to secure one of four positions on the team selected to represent the Air Force District of Washington in the Defender Challenge 2018 at Camp Bullis, San Antonio, Texas. (U.S. Air Force photo by Airman 1st Class Michael S. Murphy)