For the next 7 months she remained on offshore patrol in the Hawaiian Islands.

She continued offshore patrols until 31 May 1942, and then sailed east to California.

The unit's primary task at the time were offshore patrols.

She engaged in such tasks as tending scout planes, towing targets during fleet exercises, and making routine offshore patrols through 30 September.

She served with the offshore patrol in the approaches to Pearl Harbor during December 1941-January 1942.

MSC systems are similarly of value within exclusive economic zones, including, for example, offshore patrols and licensing schemes.

There through April she conducted antisubmarine and antiaircraft exercises and served with the offshore patrol.

The ship was assigned to offshore patrol and came under heavy air attack many times in the following days.

Underway from the harbor before 0900, for offshore patrol, Ramsay made sound contact with a submarine at 1120.

Halligan continued her offshore patrols 26 March.