The Military Cadets of Southern Maine was first organized in 2006 as the Maine Cadet Corps headquartered in Auburn, Maine. In 2007, the Maine Cadet Corps came under the supervision and direction of Cadet Education Association, a non-profit Maine corporation organized as a youth development agency providing youth with training, education, and high adventure opportunities within a corps of cadets structure. During 2007 the Maine Cadet Corps applied to become a unit of the American Cadet Alliance, headquartered in Dayton, Pennsylvania and operating Military Cadet Units in seventeen states across the United States.

Recognized as the Military Cadets of Southern Maine, the cadet unit has become the first American Cadet Alliance unit in the State of Maine. The unit currently supports U.S Army Cadets and U.S. Marine Corps Cadets of the Military Cadet Corps, American Cadet Alliance.