The A-12 and the later SR-71 used the NAS-14v2 astro-inertial navigation system (ANS) from the 1960s, which was particularly interesting in the pre-GPS times. The set apparently looked like this...
a-12
astro-inertialnavigationsystem
central intelligence agency
cold war
great britain
jet age
nas-14v2
northrop
nortronics
nortronics division (northrop)
space age
sr-71
strategic air command
strategic reconnaissance
united states air force
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