 One of the first was the secret US military espionage PAMOR (Passive Moon Relay) program in 1950, which sought to eavesdrop on Soviet Russian military radio communication by picking up stray signals reflected from the Moon.The return signals were extremely faint, and the US began secret construction of the largest parabolic antenna in the world at Sugar Grove, West Virginia, until the project was abandoned in 1962 as too expensive.A more successful spinoff was the US Navy Communication Moon Relay or Operation Moonbounce communication system, which used the EME path for US military communication.