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Booster 19 and Ship 39 are the Starship booster and upper stage that are set to launch together on Starship Flight 12. This will be the first flight of Version 3 of Starship and the first flight from Starbase Pad 2.
The Flight 12 stack — Booster 19 and Ship 39 — conducted a partial tanking test. The vehicles were loaded about halfway with propellants, after which they were detanked.
The Flight 12 stack — Booster 19 and Ship 39 — conducted a Wet Dress Rehearsal (WDR) to verify the vehicles and ground support equipment function as intended during countdown ahead of launch.