Officials at Vandenberg Air Force Base will try for a third straight day to launch a Delta IV rocket.
The rocket was originally scheduled to lift-off on Wednesday, but high winds forced ULA to delay the mission.
United Launch Alliance (ULA) is planning to conduct its first launch of 2018 this afternoon with a spy satellite for the National Reconnaissance Office as its payload.
The launch will be streamed live.
The launch, which is slated to be the first of 2018 from VAFB, was delayed several times on Thursday before ultimately getting called off around 4:45 p.m., almost four hours after the launch window first opened at 1 p.m. The company has already carried out 26 launches for NRO. While it's no longer a secret, it does still use its systems to collect information and "Play a crucial role in providing global communications, precision navigation, early warning of missile launches and potential military aggression, signals intelligence, and near real-time imagery to USA forces to support the war on terrorism and other continuing operations", according to the NRO site.
United Launch Alliance scrubbed the second launch attempt of a Delta IV Medium+ (5,2) with the classified NROL-47 for the National Reconnaissance Office.