The launch was last set for Wednesday evening but was scrapped minutes before liftoff after inspection found a hydrogen leak on one of the engine sections. It was the fourth attempt this month.
Officials originally set a launch date for Thursday, but canceled those plans.
The launch will carry a top-secret payload into orbit for a mission dubbed NROL-71. It was also canceled Tuesday due to high winds at the launch site.
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Tribune reporters Kaytlyn Leslie and Nick Wilson contributed to this story.