The 1st Aircraft Carrier Squadron was a group of Royal Navy aircraft carriers assigned to the British Pacific Fleet in November 1944. They were Formidable, Indomitable, Victorious, Illustrious and Indefatigable.
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Second World War
While serving in the Pacific, within the U.S. Fifth Fleet, the squadron was designated "Task Group 57.2". During operations off Okinawa, the squadron received heavy Kamikaze attacks. Their armoured flight decks were adequate protection for the hangar decks, but the stress caused deformation of the ships' structures..
Postwar period
Theseus served as squadron flagship for the squadron in 1947.
Korean War
After the war, the "1st Aircraft Carrier Squadron, Far East Fleet" consisting of the carriers Triumph and Unicorn, with the cruiser Belfast as flagship, was en route to Hong Kong from Japan when the Korean War broke out and was sent back to Japan.