Watch a live view of the Atlas 5 launch pad with countdown audio (members only)

A replay of the United Launch Alliance Delta 4 rocket launching the Air Force’s Wideband Global SATCOM communications satellite No. 7 from Cape Canaveral, Florida.

NASA safety advisors on Thursday lauded hardware milestones on Boeing and SpaceX commercial crew capsules, but said multiple technical issues, including problems with parachutes, must be resolved before the human-rated ships are ready to carry astronauts, adding that both companies continue to pursue schedules that appear to be unachievable.

A United Launch Alliance Delta 4-Heavy rocket stands 233 feet tall at Space Launch Complex-6 at Vandenberg Air Force Base, California, ready for liftoff Saturday night carrying a top secret U.S. government spy satellite into orbit.