During World War II, academic sessions and the Corps operated on a twelve-month cycle. The Corps had grown to a brigade of 2,650 cadets consisting of two regiments with a total of five battalions. The First Battalion was primarily Infantry ROTC. The Second Battalion was Engineer ROTC and the Third, Fourth and Fifth consisted of Cadet Batteries taking Coast Artillery ROTC. Because of the war, seniors were graduated and commissioned early. Juniors were on an accelerated schedule and brought on active duty. Finally, sophomores and freshmen over 18 were largely inducted into military service. The Corps soon numbered under 300 and was organized into a single battalion.