A heavy-lift crane lowers the first half of the D-level work platforms, D south, for NASA’s Space Launch System (SLS) rocket, into High Bay 3 in the Vehicle Assembly Building (VAB) at NASA’s Kennedy Space Center in Florida. In view below are the six levels of previously installed platforms. The D platform will be installed on the south side of the high bay. The D platforms are the seventh of 10 levels of work platforms that will surround and provide access to the SLS rocket and Orion spacecraft for Exploration Mission 1. The Ground Systems Development and Operations Program is overseeing upgrades and modifications to VAB High Bay 3, including installation of the new work platforms, to prepare for NASA’s journey to Mars.