NASA's new Mobile Launcher (ML) for the Space Launch System (SLS) was rolled to launch pad 39B beginning Thursday 30th August where it completed fit checks at the pad.<br /><br />The Mobile Launcher was built for the Constellation Program (CxP) and Ares I but was modified for SLS after the CxP cancellation.<br /><br />Currently the SLS's first launch is set for 2020.
