In May 1965, MAG-12 deployed to Chu Lai, Vietnam, to support Marine infantry and other allied forces in their engagements against the Viet Cong and the North Vietnamese Army units. The Group participated in many large operations, including the recapture of Hue City and the relief of besieged units at Khe Sanh. Two more Navy Unit Citations were received as a result of the Group's contribution to the Vietnam War effort. After almost 5 years of combat, MAG-12 was withdrawn from the Republic of Vietnam in February 1970, and reestablished at MCAS Iwakuni, Japan.