 On 2 October HMM-361 replaced HMM-261.On 1 February 1964, HMM-364 replaced HMM-361 at Da Nang AB, together with its combat support missions HMM-364 was tasked with training VNAF personnel in helicopter operations as it was intended that they would be the last USMC helicopter unit deployed to Vietnam and would depart by 30 June.Following harassment attacks on the Marine compound, on 24 March a platoon from 1st Battalion 9th Marines was deployed to Da Nang AB to increase base security.