On 15 July 1943, "Beaver" sailed for the United States and, after an uneventful passage, arrived in New York later that month. Needed to support the growing American submarine offensive in the Pacific, the tender got underway 10 days later for San Diego, via the Panama Canal. After a brief overhaul in San Diego, she sailed for Alaska on 20 September. Assigned to SubRon 45 at Dutch Harbor, "Beaver" furnished tender services to North Pacific Force submarines when they returned from patrols in the northern Kurils and the Sea of Okhotsk. Her crew also helped establish and run a submarine base at Attu.