A United Launch Alliance Delta 4-Heavy rocket lifted off from Cape Canaveral at 8:09 p.m. EST Thursday (0109 GMT Friday). The long-delayed mission is carrying a classified spy satellite into orbit for the National Reconnaissance Office.

NASA’s four Magnetospheric Multiscale mission spacecraft were encapsulated Feb. 23 in the United Launch Alliance Atlas 5 rocket’s nose cone at the commercial Astrotech processing campus in Titusville. Delivery of the payload to the Atlas 5 assembly building for mating occurred on Friday, Feb. 27.

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.