The USS Aegir (AS-23) was the lead ship of the Aegir-class submarine tenders constructed for the United States Navy during World War II. Laid down on March 31, 1943, by Ingalls Shipbuilding Company in Pascagoula, Mississippi, she was launched on September 15, 1943. The vessel was sponsored by Mrs. James A. Sweeney and initially placed in temporary commission on November 20, 1943, to facilitate her transfer to a conversion yard. She was converted into a submarine tender by Todd Shipyards Corporation in Brooklyn, New York, and was formally commissioned in full at the Brooklyn Navy Yard on September 8, 1944. Constructed with a hull designed to support submarine operations, Aegir’s specifications include a length typical of tender ships of her class, and she was equipped to provide refitting, repair, and logistical support to submarines. After her commissioning, she underwent shakedown training in New London, Connecticut, before departing for Pearl Harbor via the Panama Canal and San Diego, arriving in Hawaii on November 18, 1944. Assigned to Submarine Squadron 24, she operated primarily at Midway Island until September 1, 1945, offering essential tender services to submarines during the Pacific campaign. Following the end of hostilities, Aegir returned to the United States, arriving at Mare Island Naval Shipyard on September 11, 1945. She provided support to submarines awaiting decommissioning before being placed out of active service on October 18, 1946, and placed in reserve. She later served as a maintenance ship at San Diego and remained at Mare Island until her name was struck from the Navy list on June 1, 1971. The vessel was sold for scrap to National Metal and Steel in California on May 16, 1972. The USS Aegir played a vital role as a support vessel during World War II, contributing significantly to submarine fleet readiness and operations in the Pacific theater.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.