In the fall of 1939, a Canadian Officer Training Corp was established at the university, with training beginning in January 1940. The Canadian Officers' Training Corps, University of Ottawa Contingent, which comprised a company, headquarters and three platoons in 1939, was authorized to become a battalion in 1940. By 1941, the unit swelled to 550 men. An air force Officers' Training Corp was created in 1942 and a naval Officers' training corp in 1943. Participation in one of the three corps became mandatory for all students over 18, although they were not obliged to participate in the actual war at the end of their studies. During this time, the Royal Canadian Air Force used parts of the university's grounds for training and the university constructed barracks to house members of the Canadian Women's Army Corps. In total 1,158 students and alumni of the university enrolled the Canadian Forces during the Second World War, of which 50 died overseas. The unit was eventually disbanded during the unification of the Armed Forces in 1968.