Video: Post-launch news conference

Juggling simultaneous launch campaigns on both coasts, a team of SpaceX engineers put a Falcon 9 rocket through a customary countdown rehearsal and hold-down firing Tuesday at Vandenberg Air Force Base in California ahead of a scheduled liftoff Sunday.

This is the pre-launch news conference held Dec. 2 at NASA’s Kennedy Space Center for liftoff of the Orbital ATK commercial Cygnus cargo ship aboard a United Launch Alliance Atlas 5 rocket for the International Space Station.

The U.S. military’s experimental spaceplane will soon soar to orbit using a SpaceX Falcon Heavy rocket for the first time, a Pentagon news release announced. The X-37B spacecraft will launch from the Kennedy Space Center no earlier than December 7.