The Search for Extraterrestrial Intelligence Institute is a non-profit organization that searches the universe for signs of extraterrestrial life. SETI uses electromagnetic signals, radio signals and optical telescopes to search for deliberate signals from extraterrestrial intelligence.
In the early morning of July 2, 1996, SETI technician Richard Yamuro was the first to detect a alien signal (which later reveal to be a countdown for the aliens' attack on Earth). Although SETI was initially excited of their discovery, they grew concerned when they triangulate the source of the signal to the Moon. SETI immediately notified the Pentagon and the U.S. Government.
After the aliens made their appearance to the world, SETI helped in the ill-fated Operation Welcome Wagon by providing mathematical formulas to communicate with the aliens.