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International maritime signal flags - Wikipedia
Lists of naval flags - Wikipedia
Jack of the United States - Wikipedia
U.S. Navy Signal Flags and their Meaning - Unofficial US Navy Site
Signal Flags Meanings | Navy Signal Flags - All Star Flags
US Navy Battle Flags: A Visual Guide | Military.com
Nautical Flags: Essential Guide for Maritime Communication
Nautical Flags and Their Meanings - MarineWaypoints.com
Meanings of International Maritime Signal Flags - ANBG
The U.S. Navy's Jack - NHHC