Launched between 1971 and 1987 primarily to collect intelligence data on foreign weapon testing, the last satellites in the ...

After spying on the electronic signals of adversaries for decades, the NRO's enigmatic Jumpseat spy satellite has emerged from the darkness.

Axis Sigint collaboration: a limited partnership / David Alvarez -- Automating American cryptanalysis 1930-45: marvelous machines, a bit too late / Colin Burke -- Signals intelligence in Australia ...