Staff Sgt. Matthew Ratchford, 11th Security Support Squadron military working dog handler, fires an M4 carbine as part of the Defender Challenge 2020 on Joint Base Andrews, Md., Feb. 27, 2020. JBA defenders competed for an opportunity to represent Air Force District of Washington team in the DC2020 in Camp Bullis, San Antonio, Texas. The challenge will focuson the capability, lethality and readiness of each team. (U.S. Air Force photo by Staff Sgt. Andrew Walck)