A profile of the design of Takanis Bay, which was shared by all Casablanca-class escort carriers.
Thetis Bay was a Casablanca-class escort carrier, the most numerous type of aircraft carrier ever built,[3] and was designed specifically to be rapidly mass-produced using prefabricated sections, in order to replace heavy early-war losses. By the end of their production run, the time taken between laying down the hull and launching the ship had been cut down to nearly one month. Standardized with her sister ships, she was 512 ft 3 in (156.13 m) long overall, had a beam of 65 ft 2 in (19.86 m), and a draft of 20 ft 9 in (6.32 m). She displaced 8,188 long tons (8,319 t) standard and 10,902 long tons (11,077 t) with a full load. She had a 257 ft (78 m) long hangar deck and a 477 ft (145 m) long flight deck. She was powered with two Skinner Unaflowreciprocatingsteam engines, which drove two shafts, providing 9,000 horsepower (6,700 kW), thus enabling her to make 19 knots (35 km/h; 22 mph). The ship had a cruising range of 10,240 nautical miles (18,960 km; 11,780 mi) at a speed of 15 knots (28 km/h; 17 mph). Her compact size limited the length of the flight deck and necessitated the installment of an aircraft catapult at her bow, and there were two aircraft elevators to facilitate movement of aircraft between the flight and hangar deck: one each fore and aft.[3][4][5]
One 5 in (127 mm)/38caliberdual-purpose gun was mounted on the stern. Anti-aircraft defense was provided by eight Bofors 40 mm (1.6 in) anti-aircraft guns in single mounts, as well as twelve Oerlikon 20 mm (0.79 in) cannons, which were mounted around the perimeter of the deck.[5] By the end of the war, Casablanca-class carriers had been modified to carry thirty 20 mm (0.79 in) cannons, and the amount of Bofors 40 mm (1.6 in) guns had been doubled to 16, by putting them into twin mounts. These modifications were in response to increasing casualties due to kamikaze attacks. Although Casablanca-class escort carriers were designed to function with a crew of 860 and an embarked squadron of 50 to 56, the exigencies of wartime often necessitated the inflation of the crew count. Casablanca-class escort carriers were designed to carry 27 aircraft, but the hangar deck could accommodate more, which was often necessary during transport or especially training missions, due to the constant turnover of pilots and aircraft.[5][6]
Following her conversion into a helicopter assault carrier, she was 512 ft 3 in (156.13 m) long overall, had a beam of 65 ft 2 in (19.86 m), and a draft of 22 ft 6 in (6.86 m). She displaced 7,800 long tons (7,900 t) standard and 11,000 long tons (11,000 t) with a full load, and could make 19.3 knots (35.7 km/h; 22.2 mph) at full speed. She had a designed complement of 900 crew and 938 troops, was armed with four twin 40 mm (1.6 in) anti-aircraft guns, and carried twenty helicopters.[5][1]
An aerial photo of Thetis Bay's starboard side as it steams westwards in the Pacific, 7 August 1944.
Upon being commissioned, Thetis Bay underwent a shakedown cruise down the West Coast to San Diego, California. Upon finishing, she was assigned to transport duty, and proceeded north towards San Pedro to take on a load of aircraft and passengers. She put out to sea on 5 June, stopped at Pearl Harbor on 11 June, and headed out, via Makin Island of the Gilberts Islands and Majuro of the Marshall Islands, to Kwajalein. There, she took on the 50th Engineer Combat Battalion of the United States Army, which she deposited back at Pearl Harbor on 5 July.[9]
On 7 July, Thetis Bay got underway for Alameda ferrying 41 aircraft that required repairs. She steamed into port on 13 July, and after unloading her cargo, headed for Terminal Island, Los Angeles for a three-week overhaul. Finishing in August, she resumed transport duties on 11 August, delivering spare parts, replacement aircraft, and military passengers from the West Coast to bases in Hawaii and the Marshalls. After completing her first transport tour on 13 September, she made five more round-trip missions, spanning September 1944 to mid-April 1945, ferrying supplies from the United States to a variety of destinations in the Pacific, ranging from Pearl Harbor to Finschhafen, New Guinea. During this period, Captain Benjamin Eugene Moore Jr. raised his flag over the ship on 21 January 1945.[9]
On 12 June, Thetis Bay steamed into Pearl Harbor carrying a load of aircraft, having departed from San Diego. There, she was assigned to become a replenishment carrier as a part of Task Group 50.8.4, the mobile replenishment group supporting the frontline Fast Carrier Task Force. Replenishment escort carriers such as Thetis Bay enabled the frontline carriers to replace battle losses, and to stay at sea for longer durations of time. She first headed to Apra Harbor in Guam of the Mariana Islands, arriving on 25 June. Then, she headed westwards, making her first rendezvous with the fast carriers on 12 July, when she transferred 40 of her replenishment aircraft. She returned to Guam on 22 July to take on more aircraft, before she departed on 24 July, making another rendezvous on 31 July. She then replenished at Guam, before heading out once again, resupplying the frontline carriers from 14 August to 8 September. As she began her replenishment mission, news broke of the Japanese surrender, and her replenishment aircraft were used to support the initial landings in the Occupation of Japan.[9]
Post-war
A Sikorsky HUS-1 Seahorse demonstrates a mock rescue at sea, with Thetis Bay in the backdrop. Circa 1955–57, as evidenced by the hull symbol on the bow.Thetis Bay photographed from the stern in 1956, after it had undergone extensive conversion into a helicopter carrier. The part of the flight deck that has been cut is distinctly visible.
Upon finishing her replenishment mission, Thetis Bay returned to the United States via Guam, arriving at Alameda on 7 September. There, she joined the "Magic Carpet" fleet, which repatriated U.S. servicemen from throughout the Pacific. She cruised around the Pacific, making stops and returning U.S. servicemen back to the mainland. During one of her stops, Captain Allen Smith Jr. took over command of the vessel on 19 October. She completed her "Magic Carpet" duties, and was discharged in January 1946. Inactivation work was conducted in the Naval Inactive Ship Maintenance Facility at Bremerton, Washington. Upon the completion of that work, she was decommissioned and mothballed on 7 August 1946, joining the Tacoma group of the Pacific Reserve Fleet.[9]
In May 1955, Thetis Bay was withdrawn from the Pacific Reserve Fleet and towed to the San Francisco Naval Shipyard under project SCB 122, where she began conversion into the Navy's first assault helicopter aircraft carrier. On 1 July, she was redesignated as such, receiving the hull symbol CVHA-1. Ships of her type were expected to act as a complement to attack transports, providing them with vertical assault capabilities. She was recommissioned on 20 July 1956, with Captain Thomas Winfield South, II, in command. Her conversion was finally completed six weeks later on 1 September, with a portion of the aft section of her flight deck having been cut away.[9]
Thetis Bay underway in 1963, location unknown. Note her reconfigured flight deck.
Thetis Bay then proceeded southwards towards her new home part, arriving at Long Beach on 20 September. There, she took on the helicopters of Marine Corps Test Unit No. 1, based at Camp Pendleton, who demonstrated landing and take-off techniques on this novel type of ship. She then participated in amphibious training exercises off of the California coast, evaluating her planned complementary role, before deploying to the Far East on 10 July 1957. Having completed a short tour of duty, she returned to Long Beach on 11 December, where she resumed local operations. During 1958 and 1959, she conducted a variety of operations, including vertical envelopment exercises off of Luzon, the Philippines, throughout February 1958.[9][1]
On 28 May 1959, she was reclassified as a landing platform helicopteramphibious assault ship, and thus, received the hull symbol LPH-6. In August 1959, severe flooding, starting on 7 August, exacerbated by Typhoon Billie, which had earlier struck in July, killed more than a thousand people in Taiwan. Thus, Thetis Bay, which was serving with the Seventh Fleet at the time, was dispatched from Hong Kong on 12 August, proceeding to Taiwan to conduct relief operations. There, she used her 21 Marine Corps Sikorsky H-34s of Marine Helicopter Transport Squadron (Light) 261 (HMR(L)-261) to ferry aid and transport stranded civilians. She completed her mission on the noon of 20 August, at which point the helicopters had delivered a total of 1,600,540 lb (725,990 kg) of aid. In addition, the helicopters had ferried 850 passengers throughout the operation.[9]
Thetis Bay, in May 1960, took part in a training night assault landing at Camp Pendleton. During the operation, her helicopters carried 1,300 troops and 30 t (30 long tons; 33 short tons) of cargo to the objective area. This practice operation represented the first large-scale night landing of ground forces by helicopters based on board a carrier. She deployed to the western Pacific for the spring of 1961, and upon completing her tour and returning to Long Beach, she was transferred to the United States Atlantic Fleet. She arrived at Norfolk, Virginia, her new home port, in early December 1961.[9]
For the next three years, Thetis Bay operated along the Atlantic coast and in the Caribbean. In October 1962, during the height of the Cuban Missile Crisis, she proceeded into the naval "quarantine" area along with her helicopter contingent and a marine landing team, standing by for potential actions. In the spring of 1963, she ferried special aircraft required for PresidentJohn F. Kennedy's planned visit to West Germany to Hamburg.[1] In September 1963, she headed to Haiti, which had been affected by Hurricane Flora. She anchored off Port-au-Prince and launched Marine helicopters carrying medical aid and food supplies.[9]
Thetis Bay left Norfolk on 5 January 1964, heading to the Naval Inactive Ship Maintenance Facility in Philadelphia, Pennsylvania, for inactivation work, arriving there on 6 January. There, she was decommissioned, once again, joining the Philadelphia group of the Atlantic Reserve Fleet. She was struck from the Naval Vessel Register on 1 March 1964, and she was sold for scrapping in December 1964 to Peck Iron & Metal Co., Inc., headquartered at Portsmouth, Virginia. She was proposed to be transferred to the Spanish Navy, but the Independence-classlight aircraft carrierCabot was sent in her place.[11][12] She was ultimately broken up in 1966. Thetis Bay received one battle star for her World War II service. Her name plate is on display at Freedom Park, Omaha, Nebraska.[9][13]
Chesneau, Robert; Gardiner, Robert (1980), Conway's All the World's Fighting Ships 1922–1946, London, England: Naval Institute Press, ISBN9780870219139
Y'Blood, William (2014), The Little Giants: U.S. Escort Carriers Against Japan (E-book), Annapolis, Maryland: Naval Institute Press, ISBN9781612512471
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