海軍

When he left the navy, he found it hard to adjust to life ashore

I went into the navy

It seems the navy jets had a major screw-up in navigation and they bombed their own troops by mistake

He has received a commission as a naval officer

My father was in the navy

They made the pilot fly the Navy helicopter

Even at the end of the nineteenth century, sailors in the British Navy were not permitted to use knives and forks because using them was considered a sign of weakness