An Aviation Boatswain's Mate stands the Deck Edge Safety watch, ensuring that the flight deck is all clear for an F/A-18 Hornet preparing to launch from one of four steam powered catapults aboard USS Harry S. Truman (CVN 75)

Aircraft carriers are warships that act as airbases for carrier-based aircraft. In the United States Navy, these consist of ships commissioned with hull classification symbols CV (aircraft carrier), CVA (attack aircraft carrier), CVB (large aircraft carrier), CVL (light aircraft carrier), CVN (aircraft carrier (nuclear propulsion) and CVAN (attack aircraft carrier (nuclear propulsion). The first aircraft carrier commissioned into the United States Navy was USS Langley (CV-1) on 20 March 1922.