After being put back in position around the Delta 4-Heavy rocket after Thursday’s weather scrub, the 330-foot tall mobile service tower is retracted again at Cape Canaveral’s pad 37B for launch that will place the NROL-37 payload into Earth orbit.

Two American astronauts and one Russian cosmonaut boarded their Soyuz MS-06 landing craft for a homecoming Tuesday night, U.S. time, concluding 168 days in orbit. The trio undocked from the International Space Station at 5:08 p.m. EST (2208 GMT), and landed on the snowy steppe of Kazakhstan at 9:31 p.m. EST (0231 GMT Wednesday).

After a brief delay to chase away a boat from offshore waters, Japan’s H-2A rocket launched at 0650 GMT (1:50 a.m. EST) with the Telstar 12 Vantage telecom satellite. The launch from marks the first flight of an H-2A rocket with an upgraded upper stage, and the launcher’s first dedicated commercial mission.