Hubert Davis, Headquarters Training and Doctrine Command assistant deputy chief of staff, begins the final 5K run for the Civilian Commanders Cup Fitness Challenge alongside other participants at Fort Eustis, Va., June 23, 2016. The challenge was open to all Eustis personnel, competing to see who could reduce their 5K run time the most. (U.S. Air Force photo by Airman 1st Class Derek Seifert)