HMM-766 was activated at Minneapolis, MN in 1958 as one of the first dozen Marine Reserve helicopter squadrons. For the next 18 years, the squadron would train Marine Reservists in the Twin Cities area.
HMM-766 was operating the UH-34D when it was deactivated in 1976.
Activated 15 April 1958 at Minneapolis, MN, as MARINE HELICOPTER TRANSPORT SQUADRON 766 (HMR-766).
Redesignated 1 April 1962 as MARINE MEDIUM HELICOPTER SQUADRON 766 (HMM-766).
Deactivated 1 October 1976.