Watch a live view of the Atlas 5 launch pad with countdown audio (members only)

Rocketing through gloomy skies with a payload clouded in a veil of secrecy, a United Launch Alliance Atlas 5 rocket fired away from Cape Canaveral on Tuesday to deploy a satellite thousands of miles above Earth.

SpaceX’s Falcon 9 rocket is set for liftoff from Cape Canaveral on Thursday carrying the U.S. Air Force’s first GPS 3-series navigation satellite destined for an orbit more than 12,000 miles above Earth.

Rising from the ground and into the launch pad gantry, a clandestine U.S. national security payload was fitted atop its Atlas 5 booster rocket in California today for the ride into space on March 1.