Local operations out of Long Beach, California, continued until 2 July when she departed for Japan via Pearl Harbor, Midway, and Guam, arriving Sasebo on 13 August.

She returned to the South China Sea in February 1965; participated in a joint amphibious exercise with ships of the Royal Thai Navy; then steamed to the Vietnamese coast in mid-April to resume special duty.

Early in December she returned to the coast of Vietnam, where she joined "Operation Market Time" as a coastal surveillance patrol ship.

During her patrols she inspected hundreds of Vietnamese fishing boats in an effort to control the infiltration of Viet Cong troops and supplies.

She served along the Japanese coast until 10 April 1966 when she again sailed for South Vietnam, arriving 10 days later to resume "Market Time" patrols.

The end of May seen the ship headed up the Bassac, across the Tien Giang and back down the Mekong to Vinh Long and eventually to Vung Tau harbor.

Based on this justification all personnel serving aboard USS Gannet during the period January 26 to February 2, 1970 were authorized to wear the combat action ribbon.