Senior Airman Wes Shultz, 11th Security Support Squadron military working dog handler, and MWD Sasha, participate in a ruck-march as part of the Defender Challenge 2020 tryouts at Joint Base Andrews, Md., Feb. 27, 2020. Shultz, along with other defenders, performed drills, exercises and displayed weapon knowledge for an opportunity to represent the Air Force District of Washington in the DC2020 at Camp Bullis, San Antonio, Texas. (U.S. Air Force photo by Staff Sgt. Andrew Walck)