A: Fort Carson, Colorado, United States
In 1954 development began for NORAD of the SAGE Air Defense System, using a computer built by IBM after a design based on the Whirlwind. The interactive graphic display system included the first light pen or light gun, invented by Robert Everett.
The full SAGE (Semi-Automatic Ground Environment) automated control system for tracking and intercepting enemy bomber aircraft was completed by 1963.