Some aircraft and other exhibits are displayed externally, such as a Comet tank and replica Hawker Hurricane as gate guardians at the main entrance. Several commercial airliners belonging to the Duxford Aviation Society stand on the runway apron opposite the hangars. A Bloodhound surface-to-air missile stands on the site of the demolished hangar. A United States Air Force F-15 Eagle previously stood near the American Air Museum (now hanging inside). A Royal Engineers' Centurion AVRE stands outside the Land Warfare Hall and the Gibraltar Gun, a 9.2-inch artillery piece previously emplaced on the Rock of Gibraltar is nearby.