深海棲艦との戦いの後、艦娘の力を恐れた政府は艤装を没収した上で鎮守府機能を海上阻止活動の部署に置き換えた…的なあれです。

息抜きでかいたやつです。本編とは特に関係ありません。
【後】→

After the war with the Abyssal Fleet, the government, fearing the power of the shipgirls, seized their equipment and transferred the function of the Naval Base to the office of Naval Interdiction Operations... sort of thing.

This is just a little breather of a story. It has nothing to do with the main plot or anything.