My father was in the navy.

They made the pilot fly the Navy helicopter.

He has received a commission as a naval officer.

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.

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.