Hoisting a 15,000-pound satellite atop an Atlas 5 rocket Wednesday, United Launch Alliance finished assembling its next space-bound booster for liftoff Aug. 31 in support of the U.S. Navy.

Five European satellites, including a Italian radar surveillance craft and an ESA exoplanet probe, lifted off Wednesday at 0854 GMT (3:54 a.m. EST) from French Guiana aboard a Russian Soyuz rocket. A launch attempt Tuesday was scrubbed due to a software concern with the launch vehicle.

Follow the Atlas 5 rocket’s ascent into orbit from Cape Canaveral’s Complex 41 launch pad with the U.S. Air Force’s GPS 2F-12 navigation satellite. Launch is scheduled for Friday at 8:38 a.m. EST (1338 GMT).