Jacks Valley (sometimes written "Jack's Valley") is a training complex on the grounds of the United States Air Force Academy used for military field training. Although the area is used year round by various military units and some civilian groups, the primary use of Jacks Valley is during the second half of Basic Cadet Training (BCT) each summer, when the new cadets (or "basic cadets" as they are known during this first summer) train in a field encampment environment. The basic cadets march to and from Jacks Valley, and while they are there, undergo one of the most physically demanding parts of their training at the Academy.