USS Croaker was a Gato-class submarine and the first ship of the United States Navy to be named for the croaker, any of various fishes which make throbbing or drumming noises. - Light blue background...
US NAVY SS-419 USS TIGRONE PATCH - Tigrone is a tiger shark found mainly in tropical waters. Her name was struck from the Navy list on that same day, and she was sunk as a target on 25 October 1976...