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Tag Archives: Delta-4

Delta 4-Heavy rocket deploys spysat on final planned mission from ‘Slick Six’

EDITOR’S NOTE: Updated Sept. 25 with satellite sightings and radio signal detections. ULA’s Delta 4-Heavy rocket climbs away from Space Launch Complex 6 at Vandenberg Space Force Base to begin the NROL-91 mission Saturday. Credit: Brian Sandoval / Spaceflight Now United Launch Alliance sent a triple-core Delta 4-Heavy with a top secret U.S. government spy satellite into orbit Saturday from California’s ...

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