Jack of the United States

The jack of the United States, referred to as the Union Jack by the U.S. Navy, is a maritime jack flag flown on the bow of U.S. vessels that are moored or anchored. In addition to commissioned U.S. Navy ships, the jack is used by the U.S. Coast Guard, the Military Sealift Command, the ships of the National Oceanic and Atmospheric Administration, and other U.S. government entities.