Keywords: US Naval Surface Warfare Center Dahlgren Division gun line in June 1989.jpeg A view of the U S Naval Surface Warfare Center Dahlgren Division's gun line in June 1989 where all gun barrels bound for service aboard U S Navy ships are tested The gun line has with a single exception one of each type of gun mount currently or formerly used by the U S Navy 6444938 1989-06-21 PH2 AC Scott M Allen USN 38 32694 -77 02600 PD-USGov U S Naval Surface Warfare Center Dahlgren Division Naval guns of the United States |