America was founded on the principles of courage, equality and fairness. And for well over 200 years, America’s Navy has been instrumental in presenting these ideals to the world – through the selfless service of upstanding men and women; through their responsible use of incredibly powerful capabilities; and through the pride, purpose and professionalism that comes through in all they do. The United States Navy (USN) is the naval warfare service branch of the United States Armed Forces. It is the largest navy in the world, with a battle fleet tonnage that is greater than that of the next 13 largest navies combined. The U.S. Navy also has the world's largest carrier fleet. The service has approximately 317,054 personnel on active duty and 109,671 in the Navy Reserve. It operates approximately 288 ships and more than 3,700 aircrafts.