The government hasn't confirmed whether the top-secret satellite did indeed fall out of orbit and reenter Earth's atmosphere.
United Launch Alliance is set to carry out the classified NROL-47 mission on Thursday.
The original launch date was Wednesday, but was pushed back until Thursday due to weather.
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Because of the secretive nature of the mission, not much is known about the NROL-47 payload.
The launch of a Delta IV rocket carrying the classified satellite was targeted for 2:05 p.m. PST from complex 6 at Vandenberg Air Force Base northwest of Los Angeles.
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Additionally, Orbital ATK manufactured the propellant tank for the Delta IV upper stage roll control system at the company's Commerce, California, facility, and designed and manufactured the nozzle for the Delta IV's RS-68A engine at its Promontory, Utah, facility. "The forecast shows a 90% chance of favourable weather conditions for launch".
With more than a century of combined heritage, United Launch Alliance is the nation's most experienced and reliable launch service provider.
Colonel Greg Wood, 30th Space Wing vice commander, said: "We are ready and eager to take on this Delta launch".
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Many viewers voiced outrage at YouTube for allowing the video to be posted, since it violates the platform's community guidelines. The company wrote, "An open letter to our community - Many of you have been frustrated with our lack of communication recently".
ULA said: "The ULA #DeltaIV #NROL47" launch for the @NatReconOfc was scrubbed today due to an issue with a ground system valve. "This will be the first of two launches scheduled for NRO in 2018". "Aerojet Rocketdyne employees across the country work hard to ensure 100 percent mission success, and our role in yet another launch for the National Reconnaissance Office demonstrates the trust and confidence in our propulsion".