6. The USS Enterprise, US The Enterprise was the United State's first nuclear powered aircraft carrier, and set the pace for the future of Carriers in the U.S. It took 60,923 tons of steel to build and was one of the ships involved in the Cuban Missile Crisis in 1962. The Enterprise was one of the first ships to respond to the declaration of Operation Enduring Freedom in Fall of 2001, expending 800,000 pounds of ordnance. The ship will be decommissioned at the end of 2012 as the Gerald R. Ford-class carriers enter service. It carries up to 90 aircraft.