The KH-6 LANYARD was part of the Keyhole
series of IMINT
satellites. It was a film camera design, and produced stereoscopic
imagery. The KH-6 flew one successful mission in 1963.
Imagery from the LANYARD program, along with that from the KH-5 ARGON
and KH-1 thru KH-4 CORONA
, was recently declassified and made available to the public.