Interesting fact I learned about the red light. Some commanders forbid the use of it. Some worried the red light could be seen through the periscope eye sticking out of the water by destroyers!!! Also, at night the red glow in the command room would shine through the open hatch on the watch deck. Commanders would refuse to allow the hatch open Incase planes were flying overhead. Crazy you had to be careful for things like that!
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