Subjects included infantry strategy/tactics, leadership skills, MOS qualifications, personal finance, and mathematics.
Completion of MCI courses was generally required for promotion to the next Marine enlisted rank.
MCI ensured access to products and provided opportunities to improve performance, to enhance Professional Military Education, and to provide promotion opportunity, together with sponsors of Marine Corps education and training programs.
As a tenant company of the Marine Barracks, Washington, D.C., MCI also coordinated and executed the Hosting and Parade Escort plan for the Evening and Sunset Parades.
It provided ceremonial Officers and NCOs for the Parade Staffs and other assigned ceremonies in order to promote the Marine Corps heritage and to enhance the Marine Corps image to the general public.