Tacit Rainbow was a project to develop a jet powered mini drone for finding and destroying enemy ground based radars. Designated AGM-136A by the air force, the Tacit Rainbow could be carried to target striking distance and air launched by bombers or fighters, or launched by ground systems. Each vehicle was preprogrammed for a designated target area adn loitered until it detected transmissions from enemy radar. Once a radar source is detected and identified , the UAV homed in and destroyed it. Unlike other anti-radiation missiles, Tacit Rainbow could not be fooled if the radar was turned off to avoid being hit. As long as fuel remained, it could wait and reattack that or another radar when operation resume.