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View of the Saturn IB-style auxiliary propulsion system (APS) unit on the back side of the stage.

Picture 4 of 4.

The Saturn V APS unit was substantially larger and had more thrusters than the Saturn IB APS unit seen here.

This stage was not manufactured as a flight article, but rather as the dynamic test stage. It was fitted with dummy mass simulators rather than actual APS modules. Presumably, MSFC did not have any spare Saturn V APS modules when this stage was prepared for exhibit at the museum but did have Saturn IB APS modules.