Loading of super-cold liquid oxygen into the Atlas V rocket's Centaur upper stage in under way at Cape Canaveral Air Force Station. Tanking of the first stage booster with liquid oxygen is set to begin shortly. Liquid hydrogen propellant will be loaded in the Centaur stage.
The launch is on track for liftoff at 8:31 p.m., the opening of a 62-minute window.
A United Launch Alliance webcast of the countdown from Launch Complex 41 will begin 20 minutes before launch. You can watch it here.
The 15th flight of an Atlas V is set to deliver a next-generation military satellite into orbit.
It's the second installment of the Wideband Global SATCOM program, or WGS. The first was launched in 2007.
The third is planned this summer on a ULA Delta IV rocket from Cape Canaveral. At least five satellites, and a probable sixth, will make up the new WGS constellation.
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