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.