"Underhill" escorted shipping between Manus, Bora Bora, and Palau, until she joined a large convoy of supply and troopships. She departed Leyte Gulf on 9 July and arrived at Okinawa on 14 July 1945. There, she was assigned to radar picket duty until relieved to serve as escort commander of Task Unit 99-1-18, a convoy from Buckner Bay, Okinawa back to Leyte Gulf on 21 July 1945. The convoy included one troop ship and six LSTs carrying troops of the 96th Division back to the Philippines for rest and reinforcements. The convoy escorts were patrol craft "PC-1251", "PC-803", "PC-804", and "PC-807", sub chasers "SC-1306" and "SC-1309", and patrol craft escort "PCE-872".