The yellow palace stands behind wrought iron gates flanked by sentry boxes. Thor is ambushed by Osborn and the Sentry, but rescued by Hill. Osborn has the Sentry kill Ares instead. Sentry AWACS surveillance planes assist in the encounter. He is the inventor of the Sentry, an unmanned firefighting robotic vehicle. These are Travel Sentry and Safe Skies Locks. E-3 Sentry and a C-17 Globemaster III. He also had Air Force experience flying the KC-135 and Boeing E-3 Sentry. Iron Man returns with the Avengers, but they are unable to stop the new Sentry. Kendal escapes after killing a sentry. They survived the encounter by Hulk's mercy and the timely intervention of the Sentry. The man turned out to be an anti-Treaty sentry. The 34th and last USAF Sentry was delivered in June 1984. Cranio can rule there and Billy will be the new Sentry. Dozens of militants have been shot with the Sentry Tech system.