Stats: Delta 4 history and backlog (updated March 30)

A United Launch Alliance arrived at Cape Canaveral’s Complex 41 launch pad Friday morning after rolling out of its vertical hangar with three U.S. Air Force satellites designed to provide communications to military leaders and test new in-orbit inspection and surveillance technology.

A robotic U.S. Air Force space plane is set to land in California as soon as this week after a secretive 22-month flight hundreds of miles above Earth.

Perspectives of Friday’s United Launch Alliance Atlas 5 rocket flight were snapped from a commercial airliner, a satellite observer in Australia and the booster itself.