[2] Developed as part of the AN/USD-2 surveillance system, the SD-2 was designed for truck launch using two solid rocket boosters; following launch, a piston engine provided propulsion.

[2] Control was provided by a translateration system for navigation (similar to the much later differential GPS technology), which allowed the aircraft to steer on a pre-programmed course.

[3] The SD-2 was designed to use a modular sensor system, allowing equipment to be switched between missions according to requirements.

Available payloads included cameras for either recovered or real-time photography, AN/AAD-2 infrared sensor, AN/DPD-2 side looking airborne radar, or equipment for the dispensing of biological or chemical warfare agents from tanks mounted under the wings of the aircraft.

[2] Data from Jane's All The World's Aircraft 1965–66[4]General characteristics Performance Avionics