NASA will roll out their Space Launch System (SLS) rocket back to LC-39B, where it will perform a wet dress rehearsal (WDR) which involves loading the vehicle with propellants and taking the vehicle through the countdown to ignition where the countdown is halted. The rollout is expected to take around 11 hours, and will utilize an upgraded crawler transporter - the same system its predecessors (Space Shuttle, Ares, Saturn, etc.) used.