Photos: 200th Atlas-Centaur launches MUOS 3

A massive U.S. Navy satellite to launch from Cape Canaveral in January has arrived in Florida, kicking off a campaign to ready the mobile communications craft for flight.

The preliminary weather forecast for Tuesday evening’s Atlas 5 rocket launch carrying a Navy communications satellite predicts a 60 percent chance of acceptable conditions, with thick clouds the main threat against flying at 7:43 p.m. EST as scheduled.

Preview the United Launch Alliance Atlas 5 rocket launching the U.S. Navy’s third MUOS mobile communications satellite.