US Navy (USN) GUNNER's Mate 2nd Class Ryan Swanson from the USN Nimitz-class aircraft carrier USS ABRAHAM LINCOLN (CVN 72), discusses techniques with a Singaporean Explosive Ordnance Disposal (EOD) CHIEF Warrant Officer (CWO) outside of a World War II-era British hyperbaric chamber during classroom training, in Singapore (SGP)

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.