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The sign accompanying the Ascent Propulsion System mockup (actually, the APS engine's sign is located on the Descent Propulsion System (DPS) mockup across the room). It reads

Ascent Engine

The Apollo Lunar Lander, after descending to the lunar surface, had to return to the Command Module. The Ascent engine was designed to do this job. NASA placed heavy emphasis on high reliability and on simplicity of the design. The Ascent engine is fixed-thrust and nongimballed, capable of lifting the Ascent Stage off the moon.