The destroyer escort conducted one more convoy escort run to the Marshalls before she participated in her first major action. Subsequently returning to Ulithi in early August, the destroyer best escort girl in london returned to Okinawa on 12 August and, after fueling, got underway on 13 August as part of the screen for an Okinawa-to-Ulithi convoy. Steaming as part of the screen for Tractor Group "Easy", Vammen reached the Ryukyus on 1 April, the day of the initial landings on Okinawa. She ultimately departed the Ryukyus in early July and steamed to Ulithi before returning once more to Okinawa on 15 July, commencing patrol at station D-l, off Buckner Bay, on 22 July. Departing from Shanghai on 1 July 1946, the destroyer escort reached Pearl Harbor on 16 July via Guam and Eniwetok. On 19 July 1953, she left San Diego behind, bound for her first deployment to the Western Pacific (WestPac) since her re-commissioning. The ship underwent a lengthy availability at the Puget Sound Naval Shipyard, Bremerton, Washington, that lasted into 1946. She shifted southward to San Diego and departed that port on 20 February, bound for the Hawaiian Islands, reaching Pearl Harbor on 27 February.

After proceeding via Pearl Harbor, Midway, and Yokosuka, Vammen arrived at Sasebo, Japan, on 23 August but got underway the next morning for the key port of Wonsan on the eastern coast of North Korea. Nevertheless, she completed her assigned mission proceeding to rendezvous with the LST group on its night retirement. Later that day, she received orders to screen LST Group "Dog" during its night retirement. Detached from duty with Task Unit 51.14.2 (TU 51.14.2), for which the ship's commanding officer had been screen commander, Vammen was assigned to the western half of screening station A-39. The ships abandoned the search at 11:00 the following day, and Vammen soon resumed her screening role off Okinawa. The "Tony" suddenly emerged from the low clouds on the escort's starboard quarter, and all of Vammen's 20-mm Oerlikons that could bear opened up, joining the other ships nearby in putting up a fierce barrage of fire. As it turned out, the ship's starboard propeller had been damaged and required replacement. Arriving at San Pedro Bay on 14 April, she underwent repairs alongside Markab before she was drydocked in ARD-16 to have the damaged starboard propeller replaced.

After patrolling the entrance to Leyte Gulf from 14 to 18 March, Vammen underwent an availability at San Pedro Bay alongside tender Markab (AD-21). The destroyer escort next underwent an availability at Terminal Island, California, and San Pedro in early September, and shifted to San Diego in mid-month. Recommissioned at Mare Island Naval Shipyard, California, on 15 February 1952, Vammen operated off the west coast, out of San Diego and in the southern California area, into the summer of the following year, training. Vammen returned to Wonsan at the end of October, and, after performing a second tour of gunfire support and patrol there, returned to the west coast of the United States. Subsequently visiting Guam and Saipan, Vammen reached Pearl Harbor on 9 November on her way back to the west coast of the United States. Departing Wonsan on 11 November, the destroyer escort reached San Diego on 2 December via the Shimonoseki Straits, Yokosuka, Midway and Pearl Harbor. Vammen was subsequently decommissioned at San Diego on 3 February 1947 and placed in reserve.

A model amphibious operation, the landing on February 1 was preceded by a naval, air, and artillery bombardment so intense that "the entire island looked as if it had been picked up to 20,000 feet and then dropped," said a witness. A short while later, the destroyer escort's radar picked up one enemy plane, a Kawasaki Ki-61 "Tony", first at 10 miles (20 km) and then one mile away as it circled across the ship's bow. On 28 May, while anchored at the northern end of the transport area in Hagushi Bay, Vammen picked up Talk-Between-Ships (TBS) reports of incoming aircraft, "bogies", commencing beyond 50 miles (90 km). Underway on 3 June, Vammen, awarded an "assist" in the downing of the plane on 28 May, escorted an Okinawa-to-Leyte convoy between 3 and 8 June, sinking a Japanese mine with gunfire en route. It was while underway with that convoy two days later that the ship received the welcome news of Japan's capitulation. In 1956, while in San Diego, Vammen was used in filming a TV drama, and in 1959 the Vammen and crew were also used in filming the Jerry Lewis comedy Don't Give Up the Ship. In 1959, Vammen footage appeared in the movie Don't Give Up the Ship, starring Jerry Lewis.