She was named for Mount Mazama, a collapsed volcano in the Cascade Range in Oregon whose caldera is now occupied by Crater Lake.

Arriving at Majuro 4 June, she immediately assumed her dangerous, but extremely vital, mission of receiving and delivering ammunition to ships at sea and in port.

She continued on in support of Saipan‑Tinian operations, rearming units of the 5th Fleet, including renowned Fast Carrier Task Force 58, until 11 July.

By midafternoon, having suffered the loss of eight men, one dead and seven seriously injured, she began to transfer serviceable ammunition; unserviceable munitions were dumped at sea.

[citation needed] On 19 August she rendezvoused off the Japanese coast with TG 30.8 whose units were under orders to stand by until the signing of the official surrender document.

She then returned to the Philippines, discharging remaining cargo, and sailed to the United States, arriving 23 November at Seattle to prepare for inactivation and transfer to the Pacific Reserve Fleet.

During the month of August, she stood by in support of the Cyprus patrol as civil unrest and fighting between Greek and Turkish Cypriots threatened an uneasy peace in the eastern Mediterranean.

Departing Davisville 17 March 1966, she arrived at Subic Bay 5 May and for the next six months supported units of the 7th Fleet in operations off the coast of Vietnam.

In March 1969 she departed for the Panama Canal to start a Western Pacific cruise that lasted to November 1969 with a full ships' complement arriving April 1969 in Subic Bay.

Mazama received five battle stars for actions in the Pacific Theater of Operations at Guam, The Philippine Campaign, Saipan, Tinian, Okinawa.