The F-105 earned the nickname Thud after the character Chief Thunderthud on the Howdy Doody TV show. The main mission of the F-105G was the detection and destruction of North Vietnamese SAMs that would then allow other aircraft to safely carry out their assignments. In order for the F-105Gs to do this they were always First In Last Out and piloted by volunteers. The F-105 was the only U.S. aircraft withdrawn from combat due to high losses. Having flown 20,000 sorties over Vietnam 382 of the 833 F-105s produced were lost.