In 1955 Commandant General Royal Marines (CGRM) expressed a wish to form a Marine Cadet Section which could be incorporated into the Sea Cadet Corps. The Admiral Commanding Reserves agreed to sponsor the Marine Cadet Section. A Captain Royal Marines (Capt Toaze) was appointed to ACR as Staff Officer Royal Marines (Now Staff Royal Marines Officer - SRMO).

Director Royal Marine Forces Volunteer Reserve, now Royal Marines Reserves, was responsible to CGRM for the running, training and administration of the MCS which started with five detachments.  As an integral part of the SCC the MCS are short titled Marine Cadets. The title ‘Royal’ did not apply at that time.