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The United States Navy (USN) is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is by far the largest, most powerful navy in the world,〔(【引用サイトリンク】title=Carl Lavo: The gigantic advantage the U.S. Navy has over all others )〕〔(【引用サイトリンク】title=Speech View )〕 with the highest combined battle fleet tonnage. The U.S. Navy has the world's largest aircraft carrier fleet, with ten in service, two in the reserve fleet,〔(【引用サイトリンク】title=Sunk, Scrapped or Saved: The Fate of America's Aircraft Carriers )〕 and three new class carriers under construction.〔See USS Gerald R. Ford (CVN-78) and USS John F. Kennedy (CVN-79)〕 The service has 328,186 personnel on active duty and 110,882 in the Navy Reserve. It has 272 deployable combat vessels and more than 3,700 aircraft in active service . It has been estimated that in terms of tonnage of its active battle fleet alone, it is larger than the next 13 navies combined, which includes 11 U.S. allies or partner nations. The U.S. Navy traces its origins to the Continental Navy, which was established during the American Revolutionary War and was essentially disbanded as a separate entity shortly thereafter. It played a major role in the American Civil War by blockading the Confederacy and seizing control of its rivers. It played the central role in the World War II defeat of Japan. The 21st century U.S. Navy maintains a sizable global presence, deploying in such areas as East Asia, the Mediterranean, and the Middle East. It is a blue-water navy with the ability to project force onto the littoral regions of the world, engage in forward areas during peacetime, and rapidly respond to regional crises, making it an active player in U.S. foreign and defense policy. 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 Chief of Naval Operations (CNO) is a four-star admiral and the senior naval officer of the Department of the Navy. However, the CNO may not be the highest ranking naval officer in the armed forces if the Chairman or the Vice Chairman of the Joint Chiefs of Staff are Navy officers, who by law, outrank the CNO. ==Mission== From the New Recruits Handbook:〔http://www.cnrc.navy.mil/graphic-elements/PDFs/start_guide.pdf〕 The United States Navy is a seaborne branch of the military of the United States. The Navy's three primary areas of responsibility: * The preparation of naval forces necessary for the effective prosecution of war * The maintenance of naval aviation, including land-based naval aviation, air transport essential for naval operations and all air weapons and air techniques involved in the operations and activities of the Navy * The development of aircraft, weapons, tactics, technique, organization, and equipment of naval combat and service elements. U.S. Navy training manuals state that the mission of the U.S. Armed Forces is "to prepare and conduct prompt and sustained combat operations in support of the national interest. "As part of that establishment, the U.S. Navy's functions comprise sea control, power projection and nuclear deterrence, in addition to "sealift" duties. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「United States Navy」の詳細全文を読む スポンサード リンク
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