The Space Launch System (SLS) Mobile Launcher (ML) has conducted a major milestone, as it rolled to Pad 39B atop Crawler Transporter -2 (CT-2). Engineers are now testing the huge structure at the “clean pad” before rolling back – now set for this coming weekend – to the Vehicle Assembly Building (VAB) for one year’s worth of multi-element verification and validation testing – which is now understood to include four months of testing back at 39B – prior to being ready to accept the first SLS rocket ahead of Exploration Mission -1 (EM-1).
