[2] Assigned to a permanent station at Honolulu, she served with the Bering Sea Patrol, and assisted in enforcing the ban on deep-sea sealing.

Upon completion of her Bering Sea tour Mojave transferred to Boston and, in company with the cutters Modoc and Tampa, took up Grand Banks ice patrol duties.

When the cutters were transferred to the Navy on 1 November 1941 the schedules of the weather patrol ships Mojave, Hamilton, Spencer, Bibb, and Duane were not affected.

Only when war developments increased demand for these large cutters elsewhere were they replaced by other, smaller craft taken over by the Coast Guard for such duties as weather patrol.

While acting as escort for the slow group of Convoy SG-6 which had departed Sydney, Nova Scotia on 25 August, she assisted in the rescue of 570 men from the torpedoed army transport USAT Chatham.