Video: Liftoff of Atlas 5 with GPS 2F-10

A military communications satellite, built with international funding from Canada, Denmark, the Netherlands, Luxembourg and New Zealand, has been stacked atop a Delta 4 rocket to launch into a worldwide information-relay network operated by the U.S.

Take a walk around the Ariane 5 launch pad in French Guiana after the 16-story rocket arrived at the complex for liftoff Thursday with four European Galileo navigation satellites.

Launching the high-tech GOES-R satellite to revolutionize U.S. weather forecasting, a United Launch Alliance Atlas 5 rocket thunders away from Cape Canaveral on Saturday at 6:42 p.m. EST (2342 GMT).