Confidence/obstacle course and rappel tower at Fort Knox
Soldiers with 4th Battalion, 399th Regiment (Cadet Summer Training) descend the low wall June 5 at the CST Rappel Tower on Fort Knox, Ky. The Soldiers will lead thousands of Reserve Officers' Training Corps cadets from across the country through the confidence/obstacle course and rappel tower at Fort Knox this summer starting in early June. (U.S. Army Reserve photo by Master Sgt. Ryan C. Matson)