The term USN is an acronym for United States Navy. It is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The USN is the largest and most capable navy in the world, with the highest combined battle fleet tonnage and the world's largest aircraft carrier fleet, with eleven in service, and two new carriers under construction. The USN also has the world's largest submarine fleet, with seventy-nine in service, and twenty-four nuclear powered submarines. The USN is a seaborne branch of the U.S. military, providing power projection, as well as logistical and training support in times of peace and war. The crossword solution for USN is 'ACADEMY, ' which refers to the United States Naval ACADEMY, located in Annapolis, Maryland. The Naval ACADEMY is a four-year coeducational federal service ACADEMY that educates and trains officers for commissioning into the United States Navy and Marine Corps.