Photos: Atlas 5 rocket aims for International Space Station

On the cusp of the company’s next Cygnus resupply flight to the International Space Station set for launch Thursday night from Virginia, Northrop Grumman officials said they are eager for NASA to approve more Cygnus cargo missions beyond those already on contract through 2022.

Assuming good weather and a smooth final few weeks on the International Space Station, astronauts Doug Hurley and Bob Behnken are scheduled to undock from the orbiting research outpost Aug. 1 and return to Earth the next day to wrap up a 64-day test flight of SpaceX’s Crew Dragon spaceship.

The mobile service tower retracts from the Atlas 5 rocket, revealing the 191-foot-tall vehicle for liftoff from Vandenberg Air Force Base, California, carrying the classified NROL-79 national security payload for the U.S. government.