He is working in the navy as a petty officer.

He is serving in the navy as a lieutenant.

The naval lieutenant commander is an important position in the military.

He learned about the naval battle in an old history book.

There is a beautiful pomegranate tree in my garden.

Mr. Kaiboku is my best friend.

You can see drift ice in the Sea of Okhotsk in winter.

He was standing on the seashore, staring at the distant horizon.

He gained sailing experience in the Arabian Sea.

I have visited the Coral Sea.