United States Third Fleet

The Third United States Fleet is traditionally a United States Navy command in the Pacific. At present, it is the main central Pacific force, primarily responsible for preparation and training, with the Seventh United States Fleet the forward-deployed force in the western Pacific.

During World War II, however, there was one main U.S. Pacific Fleet, reporting to Fleet Admiral Chester Nimitz. When it was under the command of Adm. William Halsey and his plans & operations staff, it was designated Third Fleet. Halsey alternated in planning and commanding operations with Adm. Raymond Spruance; when the fleet was under Spruance's command and staff, it was designated Fifth United States Fleet.