By January 1957, however, the crisis subsided, and the ship moved north to Staten Island, New York for an overhaul, followed by a month of refresher training in April.

The tank landing ship made it only as far as Pearl Harbor before the trouble in the Orient abated sufficiently to allow her to head back to the west coast.

There, she resumed her schedule of normal operations and exercises with PhibRon 1 until 3 October when she entered the Mare Island Naval Shipyard for a two-month overhaul.

After stops at Sasebo, Japan and Buckner Bay, Okinawa Washtenaw County got underway with the other ships of PhibRon 1 for SEATO Exercise "Saddle Up," conducted along the coast of British North Borneo.

Consequently, the tank landing ship ended her deployment on schedule, returned to the west coast in November, and resumed normal operations out of San Diego.

During that time, she carried troops and equipment to various bases in the Far East, including a trip or two to South Vietnam during the initial stages of the American presence there.

When not engaged in that duty, Washtenaw County continued her routine of amphibious training at Okinawa and in the Philippines with Marine Corps battalion landing teams based at Numazu, Japan.

That phase of her service began as a result of her duty in support of the Mobile Riverine Force operating in the Mekong Delta area of South Vietnam.

She departed Yokosuka on 8 January, stopped at Da Nang to unload cargo on the 15th and 16th, and then continued on to the mouth of the Cua Tien River in the Mekong Delta where she arrived on the 17th.

For three months, she served as a mobile home for 200 Army troops and 170 sailors of the force: a joint Army-Navy organization charged with the mission to control the many waterways in the Mekong Delta.

After a brief stop at Sattahip, Thailand to embark an Army signal company, she reached Saigon on 11 April, unloaded the steel, and then continued on via Naha, Okinawa to Japan.

On 20 June the ship arrived at Can Tho in the Mekong Delta and relieved Vernon County as the support LST for the Mobile Riverine Force.

Another period of repairs, upkeep, and inspections followed as well as a training exercise with units of the Republic of Korea (ROK) Navy at Chin Hae late in September.

She arrived there on 26 October and began a two-week assignment in support of Operation Bold Dragon VIII, an amphibious search-and-destroy mission conducted at Phu Quoc Island by TF 115, the Coastal Surveillance Force.

Washtenaw County joined USS Weiss and two AH-1 Cobra helicopter gunships in providing naval gunfire support for Navy SEAL teams engaged in the actual operation.

After loading ammunition at Baie de Binh Ba and Vung Tau on 2 and 3 February, she relieved Terrell County as support LST for the Coastal Surveillance Force's Operation Market Time.

For the next six weeks, she served as a mobile supply ship for the smaller patrol craft engaged in the interdiction of enemy coastwise logistics efforts.

After a five-day Hong Kong visit and an 11-day upkeep period at Subic Bay, Washtenaw County rejoined Amphibious Ready Group "Alpha" at Da Nang on 19 October.

Washtenaw County made a brief visit to Vietnam in late February to participate in Operation Keystone Blue Jay but spent most of her time during the first part of 1970 conducting amphibious exercises.

Upon completion of a restricted availability at Yokosuka in January, Washtenaw County departed Japan to rejoin TF 115, the Coastal Surveillance Force, off the coast of Vietnam.

She also managed a visit each to Hong Kong and Kaohsiung before entering another period of restricted availability in preparation for her return to the Vietnamese combat zone.

Washtenaw County began the year 1972 at Yokosuka and departed her home port on 31 January for Iwakuni where she embarked marines for training at Okinawa.

She made a stop at Subic Bay to load ammunition desperately needed by 7th Fleet ships which were fighting hard to stem the North Vietnamese Easter Offensive.

During this tour of duty in Vietnam, the ship served at Qui Nhon until 10 July as a mobile helicopter platform in support of coastal radar stations engaged in Market Time operations.

That same day, she departed Yokosuka for Subic Bay where she underwent a restricted availability in preparation for minesweeping operations to be conducted along the coast of North Vietnam.

She reached that port on 6 April and joined TF 78, the force assigned to sweep up the mines following the termination of hostilities between the United States and North Vietnam.

Specially configured for that purpose over the previous two months and manned by a volunteer skeleton crew, she was to make several transits of the mined areas to ascertain whether or not sweeping operations had to be made.

She was scheduled to make an additional six transits the next day; but, after the first two, political complications in the negotiations between the United States and North Vietnam caused an interruption in minesweeping operations.

[4][2] Three residents from the Longview/Kelso, Washington area, Clifford Lee O'Dell Polston, Christine Faith Wilson, and Scott Chandler Miller, were arrested on 5 September 2007 on a boat near the ship.

In June 2008, the United States Coast Guard and the Port of Portland (Oregon) ordered the owner to submit plans for hazardous material abatement.