Workers monitor the Delta II second stage for NASA OCO-2, as it is lifted into position for mating with the rocket first stage in the mobile service tower at Space Launch Complex 2 on Vandenberg Air Force Base in California.
Workers monitor the Delta II second stage for NASA OCO-2, as it is lifted into position for mating with the rocket first stage in the mobile service tower at Space Launch Complex 2 on Vandenberg Air Force Base in California.