{| |- | colspan=2 | Differences as USAT Agwileon: |- | colspan=2 | Differences as USAHS Shamrock: |} USS Comfort (AH-3) was a hospital ship for the United States Navy in World War I. She was the sister ship of but the two ships were not of a ship class. Comfort was known as SS Havana in passenger service for the Ward Line, and as USAT Havana in United States Army service before her Navy service. Her name was restored to Havana in 1927, and she was renamed SS Yucatan in 1935, and SS Agwileon in 1941. In World War II, she was known as USAT Agwileon and USAHS Shamrock in service for the United States Army. Launched in 1906, SS Havana was a passenger steamer for the Ward Line on the New York–Havana route from 1907 to 1917. Before being purchased by the Navy, the ship briefly served as United States Army transport ship USAT Havana and was in the first United States convoy of ships to sail for France during World War I. In her Navy career, Comfort made three transatlantic voyages, bringing home over 1,100 men from European ports. Comfort was placed in reserve in September 1919, decommissioned in 1921, and sold in April 1925. The former hospital ship was repurchased by the Ward Line in 1927, who refitted her and placed her back in service on the Havana route under her original name of Havana. In January 1935, Havana grounded on a reef north of The Bahamas and remained there for three months. After being re-floated and repaired, she was placed back in service as SS Yucatan in June. In 1940 the ship was removed from passenger service to be converted into a freighter. After capsizing in port in 1941, the ship was again re-floated and renamed to SS Agwileon. Under a bareboat charter by the United States Maritime Commission, Agwileon carried civilian technicians and advisors to Sierra Leone for the U.S. Army. In November 1942, the ship was taken over by the Army as USAT Agwileon and converted to a troopship, making one trip in that capacity. In June 1943, the ship was selected for conversion to an Army hospital ship, and was renamed USAHS Shamrock. Operating locally in the Mediterranean for most of her career, the ship had transported almost 18,000 patients by September 1944. The ship was converted for use in the Pacific Theatre, but not before the war ended. The ship was placed in reserve in February 1946, and was scrapped in February 1948.

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