Missile Master was a US Army surface-to-air missile control complex/facility. It controlled Project Nike missiles. Virtually all Missile Masters had a bunker housing the Martin AN/FSG-1 Antiaircraft Defense System, as well as additional structures for "an AN/FPS-33 defense acquisition radar (DAR) or similar radar, two height-finder radars," and identification friend or foe secondary radar (e.g., AN/TPX-19 radar interrogator). The radars, along with Automated Data Links (ADL) from remote Nike firing units, provided data into the AN/FSG-1 tracking subsystem with the DAR providing surveillance coverage to about 200 miles (320 km).