 In August 1965 the 9th Marines assumed responsibility for the defense of the Monkey Mountain area.On 26 October 1965 two F-4B Phantoms of VMFA-115 returning to Danang Air Base from a mission crashed into the side of Monkey Mountain killing all four crewmembers.In late 1966 the USAF established a new tactical air control - north center (TACC-NS) at the base which controlled all air operations over North Vietnam.