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LST-677 was laid down on 25 April 1944 at Ambridge, Pa., by the American Bridge and Iron Co.; launched on 16 June 1944; sponsored by Mrs. Lee S. Kreeger; ferried down the Mississippi River to New Orleans; and commissioned there on 3 July 1944, Lt. Charles R. Bast, USNR, in command.

LST-677 conducted her shakedown training out of Panama City, Fla., and then loaded naval construction battalion (SeaBee) equipment at Gulfport, Miss., before embarking men of the staff of LST Flotilla 6 for transport to combat staging areas. She put to sea from New Orleans on the morning of 8 August 1944, with a convoy bound for Cuba, and then proceeded by way of the Panama Canal and San Diego to the Hawaiian Islands.

She reached Pearl Harbor on 19 September 1944 and, in the ensuing weeks, conducted amphibious warfare exercises at Maui with Army amphibious teams and their embarked tracked landing vehicles. That duty came to an end on 19 October 1944 when she moored at the amphibious repair dock at Waipio Point, Pearl Harbor, for conversion to a highly specialized type of support ship for amphibious operations.

LST-677's conversion to a landing craft tender, or self-propelled barracks ship, was completed by 21 January 1945. The ship reclassified initially to LST(M)-677 spent the following days taking on 406 tons of fresh, frozen, and dry provisions and embarking 316 officers and men of a boat pool for transportation to the Solomon Islands. She left Hawaii astern on the morning of 2 February 1945 with an amphibious task group that carried out battle rehearsals in the Solomons before proceeding by way of the Carolines to Okinawa. During the voyage to the next stop on the island hopping campaign toward the Japanese home islands, LST(M)-677 was reclassified a self propelled barracks ship, APB-43, and given the name Yolo, effective on 31 March 1945.

Yolo arrived off Okinawa on 1 April 1945, D-Day for that strongly held island and added to the gunfire that drove away enemy bombers that threatened the formation in which she was steaming. The following day, she opened fire on a suicide plane, joining the other ships nearby in putting up a devastating antiaircraft barrage that literally blew the plane to bits. That same day, she became the headquarters ship for the 70th Naval SeaBee Pontoon Barge detachment and commenced tender duties that, in the ensuing weeks, saw her service or provision small craft alongside on 916 occasions.

Yolo dispensed a grand total of 991 tons of issues including 614 tons of dry provisions and 477 tons of frozen foods; delivered nearly 200,000 gallons of fuel to small craft, handled more than 12,000 communications and brought on board several casualties from shore for emergency treatment while they were waiting to be transferred to hospital ships. Under day and night threat of enemy suicide planes and bombers, she shot down one aircraft, assisted in the downing of three others, and witnessed the destruction of more than 60 enemy planes in the vicinity of her anchorage.

Yolo's duties at Okinawa terminated on 28 June 1945 when she sailed for the Philippines with a convoy of amphibious vessels that reached San Pedro Bay, Leyte, on 3 July 1945. Upon her arrival, she reported for duty to Service Squadron 10 and was assigned to Service Division (ServDiv) 101. On 22 July 1945, she sailed for Subic Bay with fresh provisions for an attack transport and two attack cargo ships. She then embarked a draft of 60 men for passage back to Leyte. With the cessation of hostilities with Japan in mid-August 1946, Yolo became "home" for 236 men of ServDiv 101 awaiting occupation service in Japan. She headed out to sea on 3 September 1946; joined a troop convoy off Batangas, Luzon, and proceeded thence to Tokyo Bay where she anchored on 16 September 1946 less than 2-weeks after the formal Japanese surrender in Tokyo Bay.

Assigned to the Yokohama area, she provisioned small craft on an emergency basis and provided living quarters for men from various naval units until permanent facilities were established ashore. When Yolo's occupation service in the Far East came to an end, she was routed by way of the Panama Canal to Norfolk, VA., where she was decommissioned on 9 August 1946. Assigned to the Norfolk Group of the Reserve Fleet Yolo remained in reserve until struck from the Navy list on 1 May 1959. She was removed from Navy custody on 6 February 1960 and sold to the J. C. Berkwit Co., of New York City, and subsequently scrapped. Yolo (APB-43) earned one battle star for her World War II service.