S3 1, 2, 3 (S73-5, S73-6, S74-2)
Spacecraft · USA
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Original archive entry. The text, images and links below are kept as they were written.
Experimental satellite built by Boeing for USAF STP (Space Test Program), USA. Launched 1974 - 1976.
More at: S3 1, 2, 3 (S73-5, S73-6, S74-2).