Ten days later, "Mustin" reached Adak, Alaska, where she joined the patrol northwest of the island until the end of May, when her force sailed to cover the occupation of Attu Island. Through the summer, she patrolled the foggy, treacherous waters of the Aleutians, bombarding Kiska a number of times, and blocking Japanese reinforcement of that island. On the night of 25/26 July, her group was engaged in the freak "Battle of the Pips", firing on what was actually a phantom Japanese force created only on radar by unusual atmospheric conditions. After covering the American recapture of Kiska on 15 August, "Mustin" headed for a Mare Island Naval Shipyard overhaul, from which she returned to Pearl Harbor on 31 October.