Whistles, Signalling, Plastic. Manufactured by Plastic Engineering Inc. in olive drab plastic/bakelite. United States Army whistle manufactured by P.E.I. in olive drab plastic. Raised markings to one side 'U.S. ARMY'. With original cotton lanyard. Used as a ditching/survival whistle by some AAF crews and we've had had these in original boxes of 10 before marked 'AAF Stock No. 6700-997960.' Stock code S10463.