U.S. Air Force Staff Sgt. Anthony Zygmunt, 7th Reconnaissance Squadron alarm monitor, flips a tire during a physical training test as part of Air Combat Command’s Defender Challenge team selection at Joint Base Langley-Eustis, Virginia, Aug. 24, 2018. The Airmen performed a variety of exercises, including jumping jacks, sit ups and flutter kicks during the assessment. (U.S. Air Force photo by Staff Sgt. Areca T. Bell)