platform after the warhead was mated. It used a removable erector launcher manufactured by Unidynamics. The warhead carrier transported the warhead, the missile fins and the azimuth laying set used to position the missile. The PTS/PS carrier transported the programmer test station (PTS) and power station (PS). A fourth vehicle transported the Radio Terminal Set. The four vehicles were known as the land train. The PTS featured rapid missile checkout and countdowns, with complete computer control, and automatic self-test and malfunction isolation. Additionally, the PTS would perform tests that simulated airborne missile operation, programmed the trajectory of the missile and controlled the firing sequence. Plug-in micromodules increased maintainability and allowed the PTS operator to perform 80% of all repairs at the firing position. A turbine driven Power Station mounted behind the PTS, provided the primary electrical and pneumatic power and conditioned air for the missile and ground support equipment at the firing position. Collins Radio Company produced the AN/TRC-80 Radio Terminal Set specifically for the Pershing system. The "Track 80" used an inflatable dish antenna to provide line-of-sight or tropospheric-scatter voice and teleprinter communications between missile firing units and higher headquarters. The erector-launcher, PTS, PS and RTS could be removed from the carriers and air-transported in fourteen CH-47 Chinook loads. Orientation The missile was positioned or laid in on a pre-surveyed site with a system of two theodolites and a target card. Directional control passed from one theodolite to the one next to the missile. The missile then oriented to north by an operator using a horizontal laying theodolite aimed at a window in the guidance section of the missile. Using a control box, the ST-120 inertial navigation system in the guidance section rotated into alignment and the north direction programmed into the computer. Satellite launcher In 1961, Martin proposed a satellite launch system based on the Pershing. Named Pegasus, it would have had a lighter, simplified guidance section and a short third stage booster. A payload could be boosted to a circular orbit, or to an elliptical orbit with a apogee. Pegasus would have used the Pershing erector-launcher and could be placed in any open area. Martin seems to have targeted the nascent European space program, but this system was never developed. APL In 1965, the Army contracted with the Applied Physics Laboratory (APL) of Johns Hopkins University to develop and implement a test and evaluation program. APL provided