Operation Hailstone
The 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.