Team mates tag in and out as they compete in a timed, four-man group, high-intensity strength and conditioning challenge held at Osan Air Base, Republic of Korea, Sept. 30, 2015. The Osan cup is a sport-oriented, two-day event that puts squadrons and service members against each other in a battle royal to show who has the most skill, strength and knowledge. (U.S. Air Force photo/Staff Sgt. Amber Grimm)