Phoenix Echo was the codeword for a top secret plan, developed in the mid-1980s by a small office in the Pentagon, in conjunction with the National Security Agency (NSA), to electronically disrupt low-flying Soviet reconnaissance satellites. The plan was to establish a number of earth stations worldwide that would track the heights and orbits of Soviet satellites that obtained real-time imagery of U. S. and allied installations and ground forces. This information would then be relayed to the J-3EW (Electronic warfare) office of the Joint Staff at the Pentagon. In theory, the EW office could then order ground stations to disrupt the satellite downlinks.