Interesting. Note that on http://www.up-ship.com/apr/extras/Th07a.jpg
it says that a potential application was "covert photo reconnaissance
capability."

While it's not beyond debate what was meant by "covert," the following
document, posted in connection with the recent very-expensive-
program-possibly-a-stealthsat set of storries is interestig:
http://www2.gwu.edu/~nsarchiv/NSAEBB...B143/misty.pdf