In High Bay 3 inside the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida, construction workers assist during installation of the second half of the D-level work platforms, D north, for NASA’s Space Launch System (SLS) rocket. 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.