The Air Force Space Command-4 launch slated for 7:03 p.m. today has been scrubbed due to problems with the ground support equipment environmental control system that supports the launch vehicle.
The launch has been rescheduled for 6:59 p.m. July 24, according to a statement from the United Launch Alliance.
AFSPC-4 will fly on a Delta IV launch vehicle, built by ULA, and will carry three payloads. Two of those payloads are previously classified Geosynchronous Space Situational Awareness Program satellites tasked with providing images of other space vehicles residing in GEO. The third satellite, also highly classified, is part of the Automated Navigation and Guidance Experiment for Local Space, and is designed to provide data on space maneuvering.