Number 8 Squadron (sometimes written as No. VIII Squadron) of the Royal Air Force last operated the Boeing E-3D Sentry AEW1 (AWACS) from RAF Waddington, Lincolnshire. As of 2020, the RAF AWACS fleet was made up of three Sentry AEW1s, down from seven originally ordered in the late 1980s. Pursuant to the 2021 defence review, the E-3D Sentry aircraft made its final flight in U.K. service in August 2021.