A cargo ship, the "Delta Mariner", unloads a booster for the United Launch Alliance Delta IV rocket, Nov. 5, 2014, Vandenberg Air Force Base, Calif. Various Air Force personnel were on site at Vandenberg's only dock, which exists solely to accommodate the "Mariner"'s rocket deliveries. The booster will likely be used as part of the Delta 373 launch carrying the National Reconnaissance Office's NROL-45 reconnaissance satellite.