It is the only guided American air-to-air missile with a nuclear warhead to be produced; the unguided AIR-2 Genie rocket was also nuclear-armed.
Starting in 1956 Hughes Electronics began the development of an enlarged version of the GAR-1D Falcon that would carry a nuclear warhead.
The original development was for semi-active radar homing and heat-seeking versions based on the conventional GAR-1/GAR-2 weapons, under the designations GAR-5 and GAR-6, respectively.
[3] Out of concern for the problems inherent in using nuclear weapons over friendly territory, a conventional version, the GAR-11A, was developed, using a 40 lb (18 kg) explosive warhead.
The AIM-26B was produced under license (and modified) in Sweden as the Rb 27, arming Saab Draken J-35F and 35J fighters.