The squadron was then placed in cadre status at Marine Corps Air Station El Toro, California and consisted of three officers and 12 enlisted Marines. In March 1967, the squadron was reorganized and began receiving the new Boeing CH-46 Sea Knight helicopters. In October of that year, HMM-364 re-deployed to the Republic of Vietnam, initially at Phu Bai and eventually at Marble Mountain. During this tour HMM-364 participated in operations Osceola, Kentucky, Mameluke Thrust, and Hue City and finally in Operation Frequent Wind, the evacuation of Saigon. For almost half of its short 10-year existence, HMM-364 served in the Republic of Vietnam. During its three tours there, the squadron's pilots and crewmen flew almost 70,000 hours in combat and combat support missions and the squadron was awarded the Presidential Unit Citation for meritorious conduct in the performance of duty.