U.S. Air Force Staff Sgt. Justen Knighten and Staff Sgt. Jessica Smith, 86th Logistics Readiness Squadron aerial delivery supervisors, pose for a photo in Plovdiv, Bulgaria, July 19, 2018. Knighten and Smith supported Thracian Summer 18 by configuring pallets to be used in airdrop training missions to maintain qualifications for 37th Airlift Squadron aircrew members. Thracian Summer is a bilateral exercise between the U.S. and Bulgaria. (U.S. Air Force photo by Staff Sgt. Jimmie D. Pike)