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[–] bamadeplorable420 1 point 0 points (+1|-1) ago 

Rig for red served two purposes: First was to acclimate the eyes to darkness prior to going topside at night, and Second to prevent light from being emitted from the raised periscope. Even though there was a "blackout blind" on the scopes, the crew could not take the risk of light being emitted from the other end of the periscope as that light could be seen for miles.