The First navy Jack is the current U.S. Jack authorized by the United States Navy. The jack dates back to the Revolutionary War, where “Don’t Tread on Me” became a popular slogan. The rattlesnake’s rattle has 13 layers, signifying the original 13 colonies. The selection of the rattlesnake was used to convey that the U.S. would only strike if provoked. The snake symbol was officially adopted in 1778.