Combat Fitness Challenge
Senior Airman Jordan Melendez, 4th Aircraft Maintenance Squadron avionics specialist, flips a tire during the 2014 Combat Fitness Challenge at Seymour Johnson Air Force Base, North Carolina, Sept. 20, 2014. The Combat Fitness Challenge is an advanced circuit-style fitness course focusing on strength and cardiovascular fitness. (U.S. Air Force photo/Airman 1st Class Shawna L. Keyes)