The government hasn't confirmed whether the top-secret satellite did indeed fall out of orbit and reenter Earth's atmosphere.
Earlier, the launch was postponed at least two times - due to strong winds on Wednesday and due to a technical error earlier on Thursday.
The latest spy satellite mission was ULA's fits flight of 2018, and also it was the 27th successful mission of ULA for the NRO.
Because of the secretive nature of the mission, not much is known about the NROL-47 payload.
The launch of a United Launch Alliance Delta IV carrying the NROL-47 mission was scrubbed today due to an issue with a ground system valve.
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A third pointed out: "America, your President - doesn't know all the words to your national anthem". One comment read: "Super obvious Trump doesn't know the words to our National Anthem".
The mission - dubbed NROL-47 - is classified, so we don't know much about the payload and what it'll be used for once in orbit. "My honest thanks to the entire ULA team and our mission partners at the NRO and U.S. Air Force who made this, our 27th NRO launch, possible". Beginning in 2019, Orbital ATK will provide upgraded GEM 60 solid rocket boosters, designated GEM 63 and GEM 63XL, for ULA's Atlas V and new Vulcan launch vehicles, respectively. The main engine of the Delta IV is the RS-68A, manufactured by Aerojet Rocketdyne.
As the Delta 4 rocket was nearing orbit, the United Launch Alliance ended its coverage and the rest of the flight was carried out under the radar.
There's an 80 percent chance of favorable weather for the Friday afternoon launch, United Launch Alliance said on Twitter.
The Delta IV rocket was built in Decatur, Alabama. At present, that mission is scheduled to get underway on Thursday, Jan. 18 from Cape Canaveral Air Force Station's Space Launch Complex 41 located in Floridae launch is scheduled for Jan. 18 from Space Launch Complex-41 at Cape Canaveral Air Force Station, Fla.
