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The Space Launch System (SLS) is based on the American heavy expendable launch vehicle. It is part of NASA's deep space exploration plans including a manned mission to Mars.

The SLS contains:

These parts are unlocked in the Sandbox after Mission 22 is completed.

The Exploration Upper Stage is a large 2nd stage in real life, but has not been added to the game.

SLS EM-1 Launch Animation

SLS EM-1 Launch Animation