Lincoln Laboratory’s phase-coded pulse-modulation receiver/exciter for the VHF AN/FPS-17 radar, built at the Pirinçlik site in eastern Turkey by the General Electric Company, allowed U.S. observers to monitor missile test launches from Kapustin Yar, deep within the Soviet Union. Subsequent installation of another AN/FPS-17 radar on Shemya, a western island in the chain of Aleutian Islands off Alaska, made it possible for U.S. observers to monitor Soviet missile test flights to the Kamchatka peninsula. The AN/FPS-17 radar was the first demonstration of pulse compression in an operational radar system.