Now, what shall we do about the next map of this operation?

Hmmm, well, this naval district's destroyers are rather inexperienced, you see.

A. Pronounced kou. Typically translated as "Hard", but more formally it's "A", from the celestial stems of Chinese ordinals, which are used in the same way English uses A, B, C, etc in lists - especially in legal forms.

B. Pronounced otsu. "Medium" or "Normal".

C. Pronounced hei. "Easy".

D. Pronounced tei. "Very Easy", "Casual", etc.

Kashima

Hey! Admiral! by Sakazaki Freddy A riff on Kongou. "Admiral" (teitoku) is intentionally misspelled with the homophone for the tei that Kashima brings up in her dialogue. "Hey" is also a homophone with hei.