Meet the crew.

[Sailor Steve]

Originally Posted by Iron Budokan

"The gunner knows how to use the ammunition suited for the right situation. The damage is increased for all weapons."

Because before you bought a dedicated gunner for your crew they didn't know which shells to load, so you shot a lot of starshell at enemy ships.

Or maybe they kept putting them in backwards.

Or loading 20mm in the deck gun.

Or trying to load 8.8cm in the flak gun.

Who knows what those crazy sailors will do without the right man to tell them how?