NASA plans early June rollout of SLS for next countdown test
NASA said May 20 it expects to roll out the SLS from the Vehicle Assembly Building at the Kennedy Space Center to Launch Complex 39B in early June for the next attempt at a wet dress rehearsal (WDR), where the vehicle is filled with liquid oxygen and liquid hydrogen propellants and goes through a countdown that stops just before ignition of the core stage’s four RS-25 engines.