The AGM-76 was developed as a ground attack version of the AIM-47 Falcon air-to-air missile, in much the same way that the AGM-87 Focus was developed from the AIM-9 Sidewinder. It was planned to use the AGM-76 to equip the Mach 3 capable North American F-108 fighter. Although the F-108 was ultimately cancelled the AN/ASG-18 fire-control system was transferred to the Lockheed YF-12, allowing that aircraft to handle the AIM-47 and AGM-76. Twenty-two XAGM-76A prototype missiles were built; ten of these were test fired from YF-12A prototypes.