SpaceX aborts 1st launch of Space Force Tranche 0 satellites seconds before liftoff, will try again April 1

Launch of the Tranche 0 mission was scheduled for 10:29 a.m. ET on Friday (March 31).

Update for 9 a.m. EDT on March 31: SpaceX aborted an attempted launch of the Tranche 0 satellites on Thursday (March 30) with three seconds left in the countdown clock. The next possible launch opportunity is not set for Saturday, April 1 at 10:29 a.m. EDT (1429 GMT).

"Standing down from today’s launch of the @SemperCitiusSDA [Space Development Agency] Tranche 0 mission to allow more time for vehicle preparations," SpaceX wrote in a Twitter update (opens in new tab) today. "Targeting no earlier than April 1 for next liftoff attempt."