A classified military satellite that blasted off Sunday by Elon Musk's SpaceX is presumed a total loss after it failed to reach orbit, officials said Monday. While the Falcon 9 rocket launched and landed without incident, the top-secret payload, known as Zuma, apparently didn't separate as planned from the rocket and plunged back into the atmosphere, Dow Jones Newswires reported late Monday. The failed launch is a major setback for SpaceX, which has been seeking more business from the Pentagon.