USS Callisto (AGP-15) underway in Chesapeake Bay off Port Covington, Baltimore, Maryland, 19 June 1945, just after completion of conversion. This ship had one "A" frame hoist, to port.
History
Name	LST-966 Callisto
Namesake	Callisto, a nymph attendant of Artemis
Builder	Bethlehem-Hingham Shipyard, Hingham, Massachusetts
Yard number	3436[1]
Laid down	31 October 1944
Launched	29 November 1944
Commissioned	22 December 1944, reduced commission 12 June 1945, full commission
Decommissioned	9 May 1946
Identification	Hull symbol: LST-966 Hull symbol: AGP-15 Code letters: NJYI
Fate	Sold for merchant service Renamed, Elena Renamed, Daytona Lost, 20 November 1955
General characteristics
Class and type	Portunus-class motor torpedo boat tender
Displacement	4,100 long tons (4,200 t)
Length	328 ft (100 m) oa
Beam	50 ft (15 m)
Draft	11 ft 2 in (3.40 m)
Installed power	2 × 900 hp (670 kW) Electro-Motive Diesel 12-567A diesel engines 1,800 shp (1,300 kW)
Propulsion	1 × Falk main reduction gears 2 × Propellers
Speed	11.6 kn (21.5 km/h; 13.3 mph)
Boats & landing craft carried	2 x LCVPs
Complement	41 officers, 245 enlisted men
Armament	2 × quad 40 mm (1.57 in) Bofors guns 8 × single 20 mm (0.79 in) Oerlikon cannons

USS Callisto (AGP-15) was a Portunus-class motor torpedo boat tender built for the United States Navy during World War II. It was originally ordered as USS LST-966 an LST-542-class tank landing ship, but renamed and re-designated in August 1944.

Callisto was laid down 31 October 1944, at Hingham, Massachusetts, by the Bethlehem-Hingham Shipyard; launched 29 November; and commissioned 22 December 1944 for transit to its fitting out yard. Recommissioned 12 June 1945, after conversion to a Motor Torpedo Boat Tender (AGP).^[2]

After brief service for the US Navy, it was decommissioned 9 May 1946, and laid up in the Pacific Reserve Fleet. Callisto was transferred to the Maritime Commission (MARCOM) 14 May 1948, and laid up in the National Defense Reserve Fleet. It was later sold for merchant service and renamed Elena then Daytona before being lost by unknown causes on 20 November 1955.^[2]

Callisto sailed from Yorktown, Virginia, on 23 July 1945, bound for the Pacific and service with the 7th Fleet. Delayed at Pearl Harbor, by the cessation of hostilities, it reported at San Pedro Bay, Philippines, on 15 October, to serve as tender to Motor Torpedo Boat Squadron 9, busy with the varied tasks given these speedy craft as normal life was restored to the Philippines. Callisto provided berthing, maintenance, and supply facilities for its assigned squadron until 20 December, when it cleared for San Francisco.^{[citation needed]}

• Photo gallery of USS Callisto (AGP-15) at NavSource Naval History