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SSF (subsatellite ferrets)
Classified United States Air Force subsatellites, released in association with other military launches, that carried out radio and radar signals intelligence gathering. There have been several types, dating back to the 1963 "Hitch Hiker" spacecraft, but details remain secret.
Related category
• MILITARY RECONNAISSANCE AND SURVEILLANCE
Also on this site:
Encyclopedia of Alternative Energy & Sustainable Living
Encyclopedia of History