The Mobile Launcher Platform (MLP) was one of three two-story structures used by NASA to support the Space Shuttle stack during its transportation from the Vehicle Assembly Building (VAB) to Launch Pad 39A at the Kennedy Space Center, as well as serve as the vehicle's launch platform. NASA's three MLPs were originally constructed for the Apollo Program to launch the Saturn V rockets in the 1960s and 1970s, and remained in service through the end of the shuttle program in 2011 with alternations.
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Each MLP weighs 8,230,000 pounds (3,730,000 kg) unloaded and roughly 11,000,000 pounds (5,000,000 kg) with an unfueled Shuttle aboard, measures 160 feet (49 m) by 135 feet (41 m), and is 25 feet (7.6 m) high. It was carried by a crawler-transporter.