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The US Army Signal Whistle is an authentic US Army item that was produced during the Vietnam War era. Each whistle is marked U S and GPI 1971 making this whistle part of the production made for service in the Vietnam War.
These signal whistles were and still are important pieces of US Army issued field gear. They are extremely loud making them great to signal troops who are far away. They can also be used as a distress signal in the woods as the sound will carry very far.