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Lo, these many years ago (1984), when I had first aid training in US Army Basic Combat Training, they told us that the best time to apply an improvised chest seal (they suggested using the plastic wrapping the casualty's first aid dressing came in) was after the casualty had exhaled, as this would provide a better seal.Is this still considered "best practice"?
Dumb question: Is a sucking chest wound obvious? Is there always a noticeable sound?