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August 24, 2013
Inside the Astrotech Payload Processing Facility on Vandenberg Air Force Base in California, workers check the attachment of the CALIPSO spacecraft onto the upper Delta Payload Attach Fitting (UDPAF). 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.