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VANDENBERG AIR FORCE BASE, CALIF. — Inside the Astrotech Payload Processing Facility on Vandenberg Air Force Base in California, workers lower the CALIPSO spacecraft and Upper Delta Payload Attach Fitting (UDPAF) toward the Lower Delta Payload Attach Fitting (LDPAF) that contains the CloudSat satellite. Later the UDPAF will be mated with the lower Delta Payload Attach Fitting, which contains the CloudSat satellite. The PAF is the interface between the spacecraft and the second stage of the rocket. CALIPSO stands for Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation.