Atlas 5/Cygnus NASA TV broadcast

United Launch Alliance technicians raised the first stage of the company’s next Atlas 5 rocket onto a mobile launch platform at Cape Canaveral Thursday, kicking off the launch vehicle’s build-up for a mission scheduled for liftoff May 16 with the U.S. military’s hush-hush X-37B spaceplane.

United Launch Alliance teams ran through an 11-hour countdown Friday at Cape Canaveral to rehearse procedures before the first flight of a modified Atlas 5 rocket with Boeing’s Starliner crew capsule Dec. 20.

Crews hoisted a covert spacecraft atop an Atlas 5 booster rocket this morning for its trek into an equatorial orbit next week.