The enemy aircraft invaded our airspace.

We are ready to invade enemy territory.

We are conducting training to devise strategies against hypothetical enemies.

Landing ships are used to transport soldiers to the enemy's coast.

This battleship played an active role in World War II.

He works as a captain of a submarine.

A destroyer is a warship designed to pursue enemy submarines.

The corvette is responsible for maritime security duties.

The escort ship has entered the port.

His grandfather was a member of the special attack squad.