USS Siren (PY-13), briefly CMc-1, was built by Pusey and Jones, Wilmington, Delaware and launched 15 November 1929 as the yacht Lotosland. The yacht was acquired by the United States Navy in October 1940 and placed in commission as a Patrol Yacht from 1940 to 1946.

Lotosland, a yacht designed by the yacht design firm of Cox & Stevens and built in 1929 by Pusey and Jones of Wilmington, Delaware for Edward A. Deeds. The yacht's keel was laid 13 June 1929 as yard hull 408, contract 1043, and launched 15 November 1929. Deed's friend Orville Wright attended the launch ceremony. On 14 June 1930 the yacht was delivered to be registered with U.S. Official Number 229875 and signal MHWN.

Lotosland was constructed of steel with clipper bow and transom stern with two pole masts and stack placed approximately amidships. A continuous deck house on the main deck contained a dining room forward with an inside passage running through the pantry to the library and a music and living room. Aft of the deck house a clear deck 40 ft (12.2 m) in length by 20 ft (6.1 m) wide suitable for dancing and other entertainment. Above was an unusually large bridge deck housing in which there were two staterooms with private baths for the owner and his wife designed for use in tropical cruising. Seven staterooms were on the berth deck, accessed from the main deck living room above by stairs. In addition to the two for the owner were five for guests. The spaces were air conditioned by early devices called Room Coolers hidden behind decorative grill work. Woodwork was teak and black walnut. Fireplaces were marble. Lotosland, even as a civilian yacht, was armed. In addition to trap shooting facilities on the stern the yacht was equipped with a one-pounder gun and a machine gun.

The steel yacht was unusual in that an organ, specially designed to resist dampness, was installed. The nine ranks of 549 pipes were installed in a special compartment on the berth deck, an area normally used for a stateroom, and the organ was installed above in the living room aft on the main deck.

An even more unusual feature for the time was capability to carry and handle an amphibious aircraft. The plane was carried on deck on the top of the after deck house and handled by a boom on the main mast. The references note the aircraft as a Loening; however, the actual aircraft was a Sikorsky S-39A four place amphibian. The original airplane was dropped as it was being lifted aboard and destroyed. It was replaced the next day by the Sikorsky.

Two six cylinder, 500 horsepower Winton diesel engines capable of a cruising speed of 12.5 kn (14.4 mph; 23.2 km/h) and a top speed of 14 kn (16 mph; 26 km/h) with fuel capacity for 12,000 nmi (14,000 mi; 22,000 km) at cruising speed.

Lotosland was purchased from Col. Edward A. Deeds on 16 October 1940 for use as a coastal minesweeper and was renamed Siren (CMc-1). On 15 November 1940, she was commissioned and redesignated a patrol yacht, PY-13.

Siren was converted for military use at the General Engineering & Ship Works yards in Neponset, Mass. Her conversion completed by mid-March. Siren reported on the 18th for duty to the Commandant of the 1st Naval District.