English: Secret base Abandoned since the end of the Cold War, this listening post at Hawklaw near Cupar was just one of many in the UK associated with GCHQ in Cheltenham. Stations such as this constituted the ground-based portion of the United States Signals Intelligence (SIGINT) System or "USSS." They were designed to intercept Morse Code, telephone, telex, radar, telemetry, and other signals emanating from behind the Iron Curtain. Currently, the US National Security Agency relies more on sophisticated SIGINT satellites with code names like Vortex, Magnum, Jumpseat, and Trumpet to gather and analyse the world's satellite, microwave, mobile phone, and high-frequency communications and signals although many ground stations remain in operation in the UK and elsewhere.