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The United States Navy, also known as the USN or the U.S. Navy, is a branch of the United States armed forces responsible for conducting naval operations. Its stated mission is "to maintain, train and equip combat-ready Naval forces capable of winning wars, deterring aggression and maintaining freedom of the seas." The U.S. Navy currently has nearly 342,000 personnel on active duty and 129,634 in the Navy Reserve; it has 276 ships in active service and more than 4,000 aircraft.

The United States Navy traces its origins to the Continental Navy, which was established during the American Revolutionary War and was disbanded shortly thereafter. The United States Constitution, though, provided the legal basis for a seaborne military force by giving Congress the power "to provide and maintain a navy."[3] Depredations against American shipping by Barbary Coast corsairs spurred Congress to employ this power[4] by passing the Naval Act of 1794 ordering the construction and manning of six frigates. The U.S. Navy came into international prominence in the 20th century, especially during World War II. It was a part of the conflict from the onset of American military involvement ? the Attack on Pearl Harbor ? to Japan's official surrender on the deck of the USS Missouri. The U.S. Navy had a role in the subsequent Cold War, in which it evolved into a nuclear deterrent and crisis response force while preparing for a possible global war with the Soviet Union.

The 21st century United States Navy maintains a sizable presence in the world, deploying in such areas as East Asia, Southern Europe, and the Middle East. Its ability to project force onto the littoral regions of the world, engage in forward areas during peacetime, and rapidly respond to regional crises makes it an active player in American foreign and defence policy.[5] The United States Navy is the largest in the world with a tonnage greater than that of the next 17 largest combined and has a budget of $127.3 billion for the 2007 fiscal year.

The Navy is administratively managed by the Department of the Navy, which is headed by the civilian Secretary of the Navy. The Department of the Navy is, itself, a division of the Department of Defense, which is headed by the Secretary of Defense. The highest ranking Navy officer is the Chief of Naval Operations.


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