Video: X-37B payload mated to Atlas 5

A United Launch Delta 4 rocket lifted off Friday from the SLC-6 launch pad at Vandenberg Air Force Base in California, powering into orbit from a historic seaside complex originally developed for crewed missions.

United Launch Alliance is set to try again to launch a Delta 4-Heavy rocket and a classified U.S. government spy satellite Thursday after delays of more than three months caused by persistent issues with the mission’s launch pad.

Watch an Atlas 5 rocket launch the EchoStar 19 satellite on December 19, 2016. This view was captured by Spaceflight Now’s camera at the NASA’s Kennedy Space Center Press Site.