The current GMI is a reactivation of the name for a Georgia National Guard Officer Candidate School (OCS) curriculum.

[1] GMI operated regularly until spring 1864 when the cadets were formed into two companies and deployed to West Point, Georgia, as a result of the Civil War.

[2] On May 14, 1864, GMI cadets fought in the Battle of Resaca and made contact with the 9th Illinois Mounted Infantry regiment.

It is based at the Clay Army National Guard Center (formerly NAS Dobbins) in Marietta at the 122nd Regiment - Regional Training Institute (RTI).

GMI/OCS is reflagged as Charlie Company, 2nd Battalion, 122nd RTI under the 78th Troop Command of the Georgia Army National Guard.