This is its first launch of the year.
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A SpaceX Falcon 9 rocket will launch from the base shortly after noon. It will be carrying into orbit a classified payload for the National Reconnaissance Office.
Officials say the mission's first stage will return to land at Vandenberg. Upon re-entry, residents across Santa Barbara, Ventura and San Luis Obispo counties could hear multiple sonic booms.
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At this time, the launch is scheduled as planned, but it could be delayed if weather conditions change.