Navy
noun, の adjective
The sea army are the branch of the military that has boats and does ocean/sea things. What's that? The navy.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
海軍にいた時、おれ的にはお前には十分すぎるぐらいやさしくしてたつもりなんだけどな。
By my standards, I was almost too nice to you when we were in the navy.
この海軍のしきたりでは、本当に悪かったなと思って反せいしている人は、自らすすんでトイレそうじをすることでせい意を見せることになっています。
As an institution of this navy, if someone is genuinely sorry about something, they have to volunteer to clean the toilet to show their good faith.
電話に出れなくてごめん。信じられないかもしれないけど、実は今海軍の船の上なんだよね。降りたら電話するね。
I’m sorry I couldn’t catch your call. Believe it or not, I’m actually on a navy ship right now. I’ll call you when I get off.