| Answer | Crossword Clue |
|---|---|
| TOURS | Periods of duty at sea |
| LEAVES | Periods of absence from duty. |
| submarines | A warship with a streamlined hull designed to operate completely submerged in the sea for long periods, equipped with an internal store of air and a periscope and typically armed with torpedoes and/or missiles |
| submarine | A warship with a streamlined hull designed to operate completely submerged in the sea for long periods, equipped with an internal store of air and a periscope and typically armed with torpedoes and/or missiles |
