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During an employee event, workers and guests watch as NASA's mobile launcher, atop crawler-transporter 2, moves slowly along the crawlerway toward the Vehicle Assembly Building on Sept. 7, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher underwent a fit check and several days of systems testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. The mobile launcher will spend seven months in the VAB undergoing testing. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.