 On 5 August 1964, following the Gulf of Tonkin incident, 6 F-102s from the 509th Fighter Squadron and 8 F-100s from the 615th Tactical Fighter Squadron (615th TFS) deployed to Da Nang AB from Clark Air Base in the Philippines.The F-100s were proposed to be used for a strike against the Vietnam People's Air Force (VPAF) Phúc Yên Air Base as part of the US response to the incident, however approval for the strike was denied.Commencing in December 1964, Da Nang AB was used to support Operation Barrel Roll, the covert air war in neighbouring Laos.