Bluejacket

Also blue-jacket.
1. A sailor or enlisted person of the Royal Navy, Commonwealth navies, the United States Navy, or the United States Coast Guard. Bluejacket derives from a blue jacket naval enlisted personnel once wore while ashore. In the Royal Navy and Commonwealth navies, the term generally is synonymous with rating and often includes petty officers and chief petty officers. In the U.S. Navy and U.S. Coast Guard, the term excludes chief petty officers.
2. More loosely, a sailor or enlisted person of any navy.