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The Falcon 9 rocket carrying a GPS satellite is due to launch from Florida’s Cape Canaveral around 9 a.m.
A successful launch would mark SpaceX's first national security space mission for the United States, Reuters reported.
The launch attempt follows the formal announcement this week of the Space Force, a new branch of the military created by order of President Donald Trump. Vice President Mike Pence visited Florida's Space Coast Tuesday, WFTV reported.