Final preparations are underway for Friday night’s flight of the ULA #DeltaIVHeavy rocket on the #NROL71 national security mission from Vandenberg Air Force Base in California. Launch is planned for 12/7, 8:19pm PT. Live blog updates start today! https://t.co/wLoggekye0 pic.twitter.com/7JUbUNh9v1

— ULA (@ulalaunch) December 5, 2018