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The one-round war: USMC scout-snipers in Vietnam. Flayderman's Guide to Antique American Firearms and Their Values. Stalkers and Shooters: A History of Snipers. John Unertl founded the John Unertl Optical Company in 1934 and the company manufactured military sniper scopes during World War II. Crosshairs on the Kill Zone: American Combat Snipers, Vietnam through Operation Iraqi Freedom.