Galactic Radiation and Background
（重定向自Solrad）
![This is a display model of a GRAB satellite at the National Cryptologic Museum.](/Images/godic/202502/12/GRAB_15001.jpg")
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Galactic Radiation and Background (GRAB) was the covername for Project Dyno ELINT intelligence satellites operated by the U.S. Naval Research Laboratory (NRL) shortly after the Cold War U-2 incident of 1960. The satellites carried two sets of instruments: an unclassified experiment (called Solrad) and a then-classified payload to collect electronic intelligence (ELINT) (called Tattletale). Of five attempted launches, two missions were successful. The program is also known by the later codeword Canes.