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Aurora funds were allotted for Senior Peg (Lockheed/Rockwell) and Senior Ice (Northrop) and their fly-off competition towards the ATB contract.


The initial SR-71 replacement was ISINGLASS (terminated circa 1968), then Advance Aerodynamic Reconnaissance System (terminated circa 1970), were two boost glide systems proposed by the CIA that resulted in no funding for a prototype aircraft. This program was given to the NRO, who had much larger funds available, but ultimately had no interest in the concept as the direction of their thrust was in space-based reconnaissance systems. Much of the interest in high speed aircraft, particularly TSTO and SSTO, fell under purview of the USAF.


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