Watch live as ULA launches a U.S. military spaceplane for its first Space Force mission

The United Launch Alliance (ULA) is targeting a liftoff time of 9:14 AM EDT (6:14 AM PDT) today for an Atlas V rockets carrying the Boeing-built X-37B orbital test vehicle on behalf of the U.S. space force, which is an autonomous winged spaceplane that looks a little like a scaled down version of the Space Shuttle .

This is the sixth mission for the X-37B, though it’s the first flown under the U.S. Space Force’s supervision, since the space plane was previously operated by the Air Force before the formation of the new wing of the U.S. armed forces.

The X-37B runs various missions for the U.S., though its specific aims are actually classified. The uncrewed test vehicle spends long periods on orbit circling the Earth while conducting these missions, with its longest mission to date being a record 780 days for its flight that landed on October 27.

This launch was rescheduled from Saturday, due to poor weather conditions, and its delay means that the SpaceX Starlink mission that was scheduled to take off from Kennedy in Florida today is now pushed out to Tuesday, due to a tropical storm that looks to be developing on Monday at its original backup date.