aviationblogs: An Air Force photo of the D-21 mounted on the M-21 launch aircraft. The M-21 launch aircraft was a special variant of the SR-71 Blackbird.

aviationblogs: An Air Force photo of the D-21 mounted on the M-21 launch aircraft. The M-21 launch aircraft was a special variant of the SR-71 Blackbird.

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from: https://jtl4.tumblr.com/post/182117217696