Heavily armed small combatants in World War II

Which World War II small combatants were most heavily armed?

PT boats and comparable German small craft are leading candidates, but individual claims need checking because some dramatic weapons are only rumored.

American PT boats and German small combatants are strong candidates for unusually heavy armament. Claims about flamethrowers illustrate the need to distinguish verified weapon fits from anecdotes. Such stories can point a historian toward records worth pursuing, but they do not establish a weapon fit on their own. Small-craft firepower needs to be assessed through documented equipment rather than wartime folklore.