After more than a decade of development and testing, US military officials are finally ready to entrust United Launch Alliance's Vulcan rocket to haul a batch of national security satellites into space.

An experimental military navigation satellite, also more than 10 years in the making, will ride ULA's Vulcan rocket into geosynchronous orbit more than 22,000 miles (nearly 36,000 kilometers) over the equator. There are additional payloads buttoned up inside the Vulcan rocket's nose cone, but officials from the US Space Force are mum on the details.

The Vulcan rocket is set for liftoff from Cape Canaveral Space Force Station, Florida, at 7:59 pm EDT (23:59 UTC) Tuesday. There's an 80 percent chance of favorable weather during the one-hour launch window. It will take several hours for the

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