Message posted by Ron on September 17, 2011 at 17:39:11 PST:
The satellite was on display at the Air & Space museum today and numerous declassified documents have been posted at http://www.nro.mil/foia/declass/GAMBHEX.html . One of Hexagon histories mentions testing of color film capabilities using representative targets in the "southwest US" for ground truth determination. Area-51 would seem to be one possible location. Presumably objects they didn't want imaged would be placed indoors...
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