RHYOLITE

RHYOLITE was the code name for a series of National Reconnaissance Office-operated satellites that collected signals intelligence for the United States. While NRO launched and operated the satellites, the primary organization concerned with reducing the data they collected was the National Security Agency.

Details of the program were revealed to Soviet intelligence by Christopher Boyce, an administrative employee of TRW Systems, and Dalton Lee, a friend of Boyce.