The United States Navy (USN) http://www.navy.mil/ is the maritime service branch of the US Armed Forces It maintains a sizable global presence, deploying in strength in areas as the Western Pacific, the Mediterranean and the Indian Ocean. It is a blue-water navy with the ability to project force onto the littoral regions of the world, engage in forward deployments during peacetime and rapidly respond to regional crises. The US Navy is part of the Department of the Navy, alongside the US Marine Corps, which is its coequal sister service.
USN falls under the administration of the Department of the Navy, under civilian leadership of the Secretary of the Navy (SECNAV). The most senior naval officer is the Chief of Naval Operations (CNO), a 4-star admiral who is immediately under and reports to the SECNAV. At the same time, the CNO is a member of the Joint Chiefs of Staff, (the second-highest deliberative body of the armed forces after the US National Security Council).
The USN components in the operating forces are:
- US Fleet Forces Command (former US Atlantic Fleet),
- US Pacific Fleet,
- US Naval Forces Central Command,
- US Naval Forces Europe,
- Naval Network Warfare Command,
- Navy Reserve,
- US Naval Special Warfare Command,
- Operational Test and Evaluation Force,
- Military Sealift Command.
The USN has 7 numbered fleets:
- Second, Third, Fifth, Sixth, Seventh and Tenth Fleets are each led by a vice admiral,
- Fourth Fleet is led by a rear admiral.
These fleets are grouped under Fleet Forces Command (former Atlantic Fleet), Pacific Fleet, Naval Forces Europe-Africa, and Naval Forces Central Command, whose commander also doubles as Cdr Fifth Fleet; the first three commands being led by 4-star admirals.