The Treasury-class Coast Guard cutters (sometimes referred to as the "Secretary" or 327-foot class) were all named for former Secretaries of the Treasury Department. The cutter Duane was named for William J. Duane, who served as the third Secretary of the Treasury to serve under President Andrew Jackson.
At the time of the Duane's decommissioning in 1985, she was the oldest active U.S. military vessel; the current oldest, the USCGC Eagle, was also built in 1936 for the German military, but only commissioned into U.S. service in 1946 after being ceded as a war reparation after World War II.
After fitting out, she departed the Philadelphia Navy Yard on October 16, 1936, and arrived at Oakland, California on November 24. She was then assigned to temporary duty in Honolulu, and arrived there on December 9, 1936, to participate in the U.S. colonization efforts of the Line Islands in the Pacific. Duane then returned to her permanent homeport of Oakland, arriving on February 25, 1937. For the next two years, she joined the Bering Sea Patrol Force for annual cruises of that area. In mid-1937 her name was shortened to merely Duane. In September 1939 she was assigned to duty with Destroyer Division 18, conducting neutrality patrols along the Grand Banks (these patrols were known as "Grand Banks Patrols"), as ordered by President Franklin Roosevelt. She departed Oakland on September 7, 1939, and arrived at her new homeport of Boston on September 22, 1939. Here she conducted four Grand Banks patrols, from October through December, 1939, completing her final patrol on January 12, 1940.
Duane was then assigned to weather patrols in the mid-Atlantic, and also carried out a survey of the western coast of Greenland in mid-1940. In late 1940 she was fitted with additional armaments, receiving anti-aircraft and anti-submarine weapons. On 14 June 1941 she rescued 46 survivors from the British tanker, which had been sunk by . She was assigned to permanent duty with the U.S. Navy on 11 September 1941, and was designated WPG-33. On 1 April 1942 Duane was reassigned from weather patrols to convoy escort duty during the battle of the Atlantic.
| Convoy | Escort Group | Dates | Notes | |
|---|---|---|---|---|
| SC 81 | 5 May 1942[1] | Iceland shuttle | ||
| SC 83 | 17 May 1942 | Iceland shuttle | ||
| ON 98 | 27–30 May 1942[2] | Iceland shuttle | ||
| ON 102 | 14–17 June 1942 | Iceland shuttle | ||
| SC 89 | 29 June 1942 | Iceland shuttle | ||
| ON 112 | 14–17 July 1942 | Iceland shuttle | ||
| SC 91 | 19 July 1942 | Iceland shuttle | ||
| ON 116 | 25–29 July 1942 | Iceland shuttle | ||
| ON 117 | 31 July-3 Aug 1942 | Iceland shuttle | ||
| ON 120 | 9-14 Aug 1942 | Iceland shuttle | ||
| SC 95 | 14 Aug 1942 | Iceland shuttle | ||
| SC 99 | 12 Sept 1942 | Iceland shuttle | ||
| ON 136 | 5-9 Oct 1942 | Iceland shuttle | ||
| SC 103 | 10 Oct 1942 | Iceland shuttle | ||
| ON 140 | 19-24 Oct 1942 | Iceland shuttle | ||
| SC 105 | 25-26 Oct 1942 | Iceland shuttle | ||
| ON 144 | 8-15 Nov 1942 | Iceland shuttle | ||
| ON 148 | 25-27 Nov 1942 | Iceland shuttle | ||
| HX 216 | 28 Nov-1 Dec 1942[3] | Iceland shuttle | ||
| SC 110 | 1-2 Dec 1942 | Iceland shuttle | ||
| ON 156 | 25-30 Dec 1942 | Iceland shuttle | ||
| SC 114 | Iceland shuttle | |||
| SC 116 | 16-24 Jan 1943 | Iceland shuttle | ||
| ON 163 | 26 Jan-3 Feb 1943 | Iceland shuttle | ||
| HX 233 | MOEF group A-3 | 12–20 April 1943 | from Newfoundland to Northern Ireland |
Duane was converted to a combined operations-communications headquarters ship in 1944. Upon completion, she was to have been taken over by the Navy and assigned the hull number AGC-6. However, this plan was dropped and she was retained for Coast Guard service (her designation then became WAGC-6). Duane was attached to the Eighth Amphibious Force in the Mediterranean Sea, and took part in "Operation Dragoon", the invasion of southern France, in August 1944. She remained in the Mediterranean until July 1945, when she returned to the United States and reverted to her previous designation WPG-33.
The ocean-weather station program was permanently established by multi-national agreement soon after the end of World War II. The Coast Guard was then assigned the duty of manning those stations for which the U.S. accepted responsibility. As the 327s completed conversion to ocean station vessels, each immediately deployed to their new stations. For most of the next twenty years, Duane and her sisters, except which was stationed in the Pacific, alternated duty between weather stations "Charlie" (850 miles northeast of St. John's, Newfoundland), "Bravo" (250 miles northeast of Cape St. Charles, Labrador); "Delta" (located 650 miles southeast of Argentia, Newfoundland); and "Echo" (850 miles east northeast of Bermuda). Sometime later these became known simply as "ocean stations." Although the crew probably considered these patrols boring, they were important to the continued growth and safety of international over-water commercial air flights. On 1 May 1965 all the vessels in her class were re-classified as high endurance cutters and she was redesignated WHEC-33.
On 4 December 1967 Duane was assigned to Coast Guard Squadron Three located off the coast of Vietnam, where she served as the flagship for Coast Guard squadron. Duane permanently departed Vietnamese waters on July 28, 1968. Duane then again returned to ocean station duty but this task was rapidly becoming obsolete. The stations were decommissioned in the early 1970s, having been overtaken by electronic aids to navigation such as LORAN. The mid-1970s were a period of transition for the Coast Guard with the passage of the Fisheries Conservation and Management Act and the nation's shift towards increased interdiction of narcotics smugglers. These operations called for off-shore patrols of up to three weeks.
Duane left Coast Guard service and was decommissioned on August 1, 1985, as the oldest active U.S. military vessel and was laid up in Boston for the next two years.
Duane is now a historic shipwreck near Key Largo, Florida, United States. The cutter was deliberately sunk on November 27, 1987, to create an artificial reef. It is located a mile south of Molasses Reef. On May 16, 2002, it was added to the U.S. National Register of Historic Places.