The modern United States Navy maintains a sizable global presence, deploying in strength in such areas as the Western Pacific, the Mediterranean, and the Indian Ocean. The United States Navy emerged from World War II as the most powerful navy in the world.

It played the central role in the World War II defeat of Imperial Japan. The United States Navy played a major role in the American Civil War by blockading the Confederacy and seizing control of its rivers. After suffering significant loss of goods and personnel at the hands of the Barbary pirates from Algiers, the United States Congress passed the Naval Act of 1794 for the construction of six heavy frigates, the first ships of the Navy. The United States Navy traces its origins to the Continental Navy, which was established during the American Revolutionary War and was effectively disbanded as a separate entity shortly thereafter. It has 290 deployable combat vessels and more than 2,623 operational aircraft as of June 2019. With 336,978 personnel on active duty and 101,583 in the Ready Reserve, the United States Navy is the third largest of the United States military service branches in terms of personnel. It has the highest combined battle fleet tonnage (4,635,628 tonnes as of 2019) and the world's largest aircraft carrier fleet, with eleven in service, two new carriers under construction, and five other carriers planned. It is the largest and most powerful navy in the world, with the estimated tonnage of its active battle fleet alone exceeding the next 13 navies combined, including 11 allies or partner nations of the United States as of 2012. The United States Navy ( USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. Occupation of the Dominican Republic (1965) Occupation of the Dominican Republic (1916).

D day naval armada