April 20 (UPI) -- SpaceX launched its third fleet of spy satellites in 8 days on Sunday, its tenth mission of the year in support of the National Reconnaissance Office, the United States' spy satellite agency. The fleet of Starshield satellites, built by SpaceX and Northrop Grumman, were aboard a Falcon 9 rocket that launched from Vandenberg Space Force Base in California at 5:29 a.m. PDT. It was the twelfth time the first stage reusable rocket has been used to shuttle a Falcon 9 into low-Earth