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A sign near the periscope. It reads

Submarine Periscopes in World War II

During World War II, each American submarine had two periscopes. The observation periscope was used most of the time, but the attack periscope was used when the sub attacked enemy ships. The two periscopes are nearly identical except that the attack scope is slightly narrower at the top, so it doesn't leave a wake in the water at the surface. This prevented the submarine from being spotted by enemy warships. Imagine you are a submarine commander sighting an enemy vessel through your periscope during World War II. How do you feel? What commands would you give?