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OSIRIS-REx, your ride is here: The booster and Centaur upper stage of a United Launch Alliance Atlas V vent gaseous propellant during a “wet dress rehearsal” test at Space Launch Complex 41 at Florida’s Cape Canaveral Air Force Station. (Photo: NASA/Kim Shiflett) OSIRIS-REx, your ride is here: The booster and Centaur upper stage of a United Launch Alliance Atlas V vent gaseous propellant during a “wet dress rehearsal” test at Space Launch Complex 41 at Florida’s Cape Canaveral Air Force Station.