Marine Heavy Helicopter Training Squadron 302 was originally designated Marine Medium Helicopter Training Squadron 302 (HMMT-302), on November 1, 1966, at Marine Corps Air Facility Santa Ana, California, and assigned to Marine Helicopter Training Group 30, 3rd Marine Aircraft Wing.
Marine Heavy Helicopter Training Squadron 302 was originally established as a medium helicopter training squadron, HMMT-302, on November 1, 1966, at Marine Corps Air Facility Santa Ana, California, and it operated under the supervision of Marine Helicopter Training Group 30, 3rd Marine Aircraft Wing.