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dsc16849.jpg

Vent holes on the aft end of the forward skirt.

The S-II stage had an engine compartment conditioning system which purged the S-II engine and interstage area of hazardous gases; some of the nitrogen gas used in this purge process exited the vehicle via these four holes (and other vents like it around the S-IC forward skirt).

 
Saturn V S-IC (First) Stage forward skirt at U.S. Space and Rocket Center
Time picture taken Tue Dec 27 11:12:12 2005
Location picture taken Rocket Park
U.S. Space & Rocket Center
Huntsville, AL
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