At Adak, on the 14th, Monssen received word of the Japanese surrender, and new orders to return to Japan with TF 92 for occupation duty in the Ominato Naval Base area. A month later she sailed for Pearl Harbor, arriving on the 24th and continuing on the next day to San Francisco. There she received orders to continue to San Diego where she joined the Pacific Reserve Fleet, decommissioning 30 April 1946.
