Black Shield missions were created to gain recce information over North Vietnam. The A-12 and sub SR-71's were perfect for the mission. Combining
ultra high speed and altitude, they were pretty much able to fly over the airspace without fear. The link is to a declassified analysis of on of the
Black Shield sorties. The intersting thing is the "no Foreign Dissemination" stamp on the cover. It does make for dry but intersting reading as
each site overflown is analyzed
I would imagine it could do better if it had a chance to evolve, the camera was much larger than the SR-71's as it sit right behind the pilot in the
Q bay, an area that was converted into the RSO position for the USAF bird.
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