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Caption: File No: GE-AA-24-13862 November 30, 1942 MESSENGERS OF DEATH 4. - A U.S. Bluejacket sights up the long, slender barrel of a 20 millimeter anti-aircraft gun to give this picture of the men and weapons that the nation is using against its enemies. The cylinder in the upper foreground feeds the bullets into the firing chamber and can be replaced by a full cylinder when empty. This particular gun is mounted on a U.S. Navy PT boat.