The 1954 interceptor, formally WS-201A, was a US Air Force project to develop a dedicated interceptor aircraft that would enter service in 1954. Several aircraft were developed as part of the project, leading to the F-102 Delta Dagger, F-106 Delta Dart, XF-103 Thunderwarrior and, indirectly, the F-101B Voodoo and F-104 Starfighter. The electronics and weapons were also destined to become common, including the AIM-4 Falcon missile and a variety of Hughes Aircraft supplied radar and fire control systems. The project also led, eventually, to the upgrading of the SAGE battle control computers to directly control the interceptors for much of their flight. Although greatly delayed, the resulting systems operated for about 20 years, into the 1980s.