The designation Task Force 16 was used for multiple units of the U.S. Navy during World War II. Prior to American entry into the war the designation was applied to an element of the U.S. Navy's Neutrality Patrols in the Atlantic, built around the battleship USS Mississippi. Next, In its most famous incarnation, in 1942-1943, it was built around the aircraft carrier USS Enterprise, and became one of the most storied task forces in the United States Navy, participating in a number of the most important battles of the Pacific War. Later still, after March 1943, when the Pacific Fleet was subdivided into a series of numbered fleets, the TF16 designation was applied to Service Force, Pacific Fleet, the main logistical organization supporting the fleet at sea; this version of TF16 was characterized as an element of the First Fleet, an administrative organization under the direct control of Admiral Chester Nimitz.