X-37B Encapsulated
Featuring the United States Space Force (USSF) logo for the first time, the encapsulated X-37B Orbital Test Vehicle for the USSF-52 Mission. (Courtesy photo from Boeing)  

Space.com: SpaceX will launch the Space Force’s mysterious X-37B space plane on a Falcon Heavy rocket Dec. 7  

The X-37B has previously launched atop the smaller Falcon 9 rocket. 

The U.S. Space Force’s shadowy X-37B is set for launch atop a SpaceX rocket. 

The reusable space plane will launch atop a SpaceX Falcon Heavy rocket from NASA’s Kennedy Space Center in Florida on Dec. 7 for its seventh overall mission, designated USSF-52.  

Read more …. 

U.S. Air Force X-37B Spaceplane To Launch On A SpaceX Falcon Heavy Rocket On December 7  

Department of the Air Force Scheduled to Launch Seventh X-37B Mission — United States Space Force 

X-37B Headed Deeper Into Space With Falcon Heavy Rocket’s Help — Warzone/The Drive 

U.S. Air Force X-37B spaceplane to launch on a SpaceX Falcon Heavy rocket — Space News
 

Space Force’s Elusive Spaceplane Is Launching on SpaceX’s Falcon Heavy for the First Time — Gizmodo

X-37B Mission to Test New Space Technologies and Study Radiation on Seeds — Space War