SpaceX managed to squeak in one moremilestone before the end of 2018. The private spaceflight company successfully launched its first-ever US national security mission, carrying the US Air Force's equally new GPS III satellite into orbit. The effort was comparatively messy as far as recent SpaceX launches go. The company delayed the launch multiple times over the past several days, and the Air Force's performance margin requirements ruled out a landing for the Falcon 9 rocket's first stage.
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