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.

NASA has selected SpaceX and United Launch Alliance to deliver to orbit a joint U.S.-European oceanography mission and the next land imaging satellite in the Landsat series on Falcon 9 and Atlas 5 rockets.

Two months after a first test-firing ended prematurely, NASA plans to ignite the core stage of the first Space Launch System heavy-lift rocket again Thursday for an eight-minute burn to confirm it is ready for shipment to the Kennedy Space Center for launch preparations.