A United Launch Alliance Delta 4 rocket went through a practice countdown and fueling exercise today to prepare for its Dec. 7 liftoff to deliver a U.S. military communications satellite into space.

A previously-flown Falcon 9 booster blasted off Friday from Vandenberg Air Force Base on California’s Central Coast with 10 new-generation communications satellites for Iridium. Launch occurred 8:27 p.m. EST (5:27 p.m. PST; 0127 GMT).

More than three weeks after a faulty electrical component halted a countdown moments before liftoff, an Ariane 5 rocket lifted off from French Guiana on Friday with two commercial communications satellites. Launch occurred at 2156 GMT (5:56 p.m. EDT).