Elon Musk’s SpaceX was poised on Tuesday to launch a new spy satellite for the U.S. military, marking what the space transportation company said was its first designated national security mission for the United States, Reuters reported.

SpaceX’s Falcon 9 rocket, carrying a roughly $500 million GPS satellite built by Lockheed Martin Corp, was scheduled for lift off from Florida’s Cape Canaveral shortly after 9 a.m. (1700 GMT) local time, the U.S. Air Force said.

Tuesday’s launch, if successful, would be a victory for Musk, a billionaire entrepreneur who has tried for years to break into the market for lucrative military space launches long-dominated by incumbents Lockheed and Boeing Co.