Watch the Falcon 9 and Crew Dragon arrive at the launch pad (members only)

A United Launch Alliance Atlas 5 rocket made its third trip to a Cape Canaveral launch pad Thursday, rolling into position for liftoff Friday afternoon with a classified payload for the U.S. government’s spy satellite agency.

United Launch Alliance technicians raised the first stage of the company’s next Atlas 5 rocket onto a mobile launch platform at Cape Canaveral Thursday, kicking off the launch vehicle’s build-up for a mission scheduled for liftoff May 16 with the U.S. military’s hush-hush X-37B spaceplane.

Loaded with more than 6,000 pounds of supplies, experiments, and hardware, a SpaceX Cargo Dragon freighter docked with the International Space Station at 1:40 p.m. EST (1840 GMT) Monday, one day after taking off from NASA’s Kennedy Space Center in Florida. This was the first Dragon cargo mission to automatically dock with the space station.