Onboard the US Navy (USN) Nimitz Class Aircraft Carrier USS DWIGHT D. EISENHOWER (CVN 69), USN Sailors, wearing personnel protective equipment, practice firefighting procedures during a mass casualty drill on the ships flight deck. The EISENHOWER and embarked Carrier Air Wing Seven (CVW 7) are currently conducting routine training operations in the Atlantic Ocean

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.