SpaceX, US Space Force set to launch secretive X-37B space plane on Dec. 10 Final preparations are underway for a Dec. 10 launch opportunity, which will mark the first time the X-37B has lifted off atop SpaceX's powerful Falcon Heavy rocket. https://cdn.mos.cms.futurecdn.net/m34Ynzik6umjCNFvwA6uUK.jpg https://www.space.com/spacex-x-37b-falcon-heavy-launch-final-preparations