courtesy of Paul Poitras
HML-770 was originally activated on 15 April 1958 at NAS Seattle, Washington as Marine Helicopter Transport Squadron 770 (HMR-770). HMR-770 had no aircraft of its own, but had to use the Naval Reserve HSS-1 (SH-34G), HSS-1N (SH-34J), and HUP-2 (UH-25B) helicopters on base.
HMR-770 was redesignated 1 April 1962, becoming Marine Medium Helicopter Squadron 770 (HMM-770). HMM-770 began operating its own UH-34D "Sea Horses" during 1968. HMM-770 relocated to NAS Whidbey Island, Washington, during November 1970. During 1971, HMM-770 began flying CH-46A/D "Sea Knights".
HMM-770 began receiving UH-1N "Hueys" during 1977, and was officially redesignated Marine Light Helicopter Squadron 770 on 15 September 1977.
HML-770 deactivated some time in 1980. The exact date is unknown to HQMC, as the squadron stopped submitting operational records in December 1979.
Activated 15 April 1958 at Seattle,
Washington, as Marine Helicopter Transport Squadron 770
Assigned during November 1960 to Marine Air Reserve Training Detachment, Marine Air Reserve Training Command, Naval Air Station Seattle.
Redesignated 1 April 1962 as Marine Medium Helicopter Squadron 770 (HMM-770).
Relocated during May 1970 to Whidbey Island, Oak Harbor, Washington and reassigned to Marine Air Reserve Training Detachment, Marine Air Reserve Training Command, Naval Air Station Whidbey Island.
Redesignated 15 September 1977 as Marine Light Helicopter Squadron 770 (HML-770).