The Commission on Training Camp Activities (CTCA), also popularly known as the Fosdick Commission, was an umbrella agency within the United States Department of War during World War I that provided recreational and educational activities for soldiers as they trained for combat. Established in April 1917, the CTCA had the mandate to keep American troops "physically healthy and morally pure", while also motivating them to fight.

The United States Department of War, also called the War Department, was the United States Cabinet department originally responsible for the operation and maintenance of the United States Army, also bearing responsibility for naval affairs until the establishment of the Navy Department in 1798, and for most land-based air forces until the creation of the Department of the Air Force on September 18, 1947.