The U.S. Air Force this week awarded SpaceX a contract to launch a Global Positioning System satellite in early 2019, concluding the second of as many as 15 competitions the military plans to run over the next year to pit SpaceX against United Launch Alliance for rights to lift defense and intelligence-gathering payloads into orbit.

SpaceX successfully deployed 60 more Starlink satellites into orbit Wednesday following launch from NASA’s Kennedy Space Center in Florida at 8:16 a.m. EDT (1216 GMT). One of the nine Merlin engines on the Falcon 9 rocket’s first stage shut down prematurely during ascent, but the launcher was still able to reach the mission’s targeted orbit.

Launching the secretive NROL-61 payload for the U.S. National Reconnaissance Office, a United Launch Alliance Atlas 5 rocket thundered away from Cape Canaveral today at 8:37 a.m. EDT (1237 GMT).