burnt-out drive motor in her surface-search (SL) radar, Vammen departed Okinawa on 8 April, screening LST Group 17 to Leyte. 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. Undocking on the 17th, Vammen returned to Okinawa at the end of April, screening LST Group 41. Detached from that escort duty on 2 May, Vammen received orders to head for the scene of a submarine sighting at 15:14 on the 5th. She arrived on the scene at 17:23, and commenced a search plan in company with , but found nothing. The ships abandoned the search at 11:00 the following day, and Vammen soon resumed her screening role off Okinawa. The destroyer escort remained off Okinawa, screening incoming ships and off transport areas, for the rest of May. 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). 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. The "Tony" suddenly emerged from the low clouds on the escort's starboard quarter, and all of Vammens 20-mm Oerlikons that could bear opened up, joining the other ships nearby in putting up a fierce barrage of fire. The "Tony" strafed a tug nearby but, hit in the tail and right wing, burst into flame, lost altitude, and crashed into the water without exploding, clear of any ships. 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. After repairs alongside Markab and a docking in for repairs to her sound gear—which had been inoperative since 22 May—the destroyer escort sailed for Lingayen in company with sistership , on her way back to Okinawa. For the remainder of June, Vammen performed the unglamorous but vital duty of screening transports and of providing local escort services to incoming convoys. 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