Challenger 's rollout from Orbiter Processing Facility (OPF) to the Vehicle Assembly Building (VAB) to be stacked with External tank and SRB's for launch. (NASA photo)

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• Challenger's rollout from Orbiter Processing Facility (OPF) to the Vehicle Assembly Building (VAB) to be stacked with External tank and SRB's for launch. (NASA photo) (STS-8)
• Challenger's rollout from Orbiter Processing Facility (OPF) to the Vehicle Assembly Building (VAB). Photo courtesy of NASA. (Space Shuttle Challenger)
• Space Shuttle Challenger's rollout from Orbiter Processing Facility (OPF) to the Vehicle Assembly Building (VAB) to be stacked with External tank and SRB's for launch. (NASA photo). (Space Shuttle)