original TF 38 came into existence in August 1943, built around , and under the command of Rear Admiral Frederick C. Sherman. TF 58 was created on 6 January 1944 with Rear Admiral Marc Mitscher commanding, serving under the fleet command of Admiral Spruance in the Fifth Fleet. TF 38 continued to exist, but as a command structure only. TF 58 proved the success of the Fast Carrier TF concept with Operation Hailstone, a massive naval air squadrons and surface vessels attack on the Japanese ships and airfield at Truk Lagoon on 17–18 February 1944. With command change from Spruance to Halsey on 26 August 1944, all units changed designations again. Mitscher, who was an aviator from early training and had a masterful command of the airgroups, requested that he retain command of the Fast Carrier Task Force until his replacement, Admiral John McCain, could have proper time to become more familiar with the handling of a carrier task force. King and Nimitz concurred. Admiral Halsey, like Spruance before him, sailed with the Fast Carrier Task Force. The force grew to nine CVs and eight CVLs in preparation for the landings on Leyte. Task Force 38 was composed of four task groups: Task Group 38.1 was commanded by Admiral McCain, with its previous commander, Admiral Joseph "Jocko" Clark, remaining on as advisor, Task Group 38.2 was under the command of Admiral Gerald Bogan, Task Group 38.3 was led by Admiral Frederick Sherman, and Task Group 38.4 was under the command of Admiral Ralph Davison. Following the Battle of Leyte Gulf, Mitscher went on shore leave and planning duty, and Vice Admiral McCain took over as commanding officer of TF 38, which continued under Halsey and the Third Fleet. In January 1945 TF 38 raided the South China Sea and attacked Japanese positions in Formosa and Luzon. On 26 January 1945, Halsey and McCain went on shore leave and planning duty, while Spruance and Mitscher returned to their previous commands. Third Fleet became Fifth Fleet, and TF 38 became TF 58. They led the fleet through the battles of Iwo Jima and Okinawa, facing sustained attacks from land-based Japanese kamikaze aircraft. As the Okinawa campaign dragged into its second month, the presence of the carriers was still required to provide close air support to the soldiers on the island as the Army and its Air Corps were not as adept as