How many cadets nationwide are enrolled in the Army Reserve Officers' Training Corps, which one brigade is based out of Great Lakes Naval Training Center in Illinois?
3rd Reserve Officers' Training Corps Brigade: The 3rd Reserve Officers' Training Corps Brigade is an Army Reserve Officers' Training Corps brigade based at the Great Lakes Naval Training Center, Illinois. Army Reserve Officers' Training Corps: The Army Reserve Officers' Training Corps (ROTC, AROTC, or SROTC) is the United States Army component of the Reserve Officers' Training Corps. Army Reserve Officers' Training Corps:  It is the largest ROTC program, with 20,000 ROTC cadets in 273 ROTC programs at major universities throughout the United States.
20,000