Live coverage: SpaceX to launch 21 data transport satellites for the Space Development Agency

The Tranche 1 Transporter Layer A mission is the fourth flight supporting the Space Development Agency’s Proliferated Warfighter Space Architecture constellation. Liftoff from pad 4E at Vandenberg Space Force Base is scheduled for 1:17 a.m. PDT (4:17 a.m. EDT / 0817 UTC).