After the Coast Guard took over the
United States Lighthouse Service in 1939, the plans for the USLS
Juniper class of seagoing buoy tenders were modified to . These were built in three classes. The
Cactus (A) class had 12 vessels, the
Mesquite (B) class had six, and the
Iris (C) class had 20. Twenty were built at one of two shipyards in
Duluth, Minnesota. Early in February 1944, a five-day storm swept the Massacre Bay area with winds up to . At Attu,
Citrus took nine men off a swamped Army tug without loss of life and then sank the foundering tug with gunfire.
Citrus also assisted in getting a Liberty ship off the beach after it had been driven ashore by a severe storm.
Citrus arrived at
Ketchikan on 7 February 1944. From 24 to 26 January 1968, the crew of
Citrus fought a fire on the Japanese motor vessel
Seifu Maru in
Dutch Harbor, Alaska. On 9 August 1968, she assisted the distressed motor vessel
Dantzler after
Dantzler ran aground, and she escorted
Dantzler from near
Cook Inlet to
Homer, Alaska. ==Awards and honors==