Keywords: US Navy 090720-N-6148D-001 Transportation personnel at Naval Support Facility Dahlgren prepare to off-load a World War I-era tractor-mounted artillery piece.jpg en DAHLGREN Va July 20 2009 Transportation personnel at Naval Support Facility Dahlgren prepare to off-load a World War I-era tractor-mounted artillery piece the first gun originally test-fired to mark the establishment of Dahlgren as a naval proving ground on Oct 16 1918 The 7-inch 45 caliber gun will be restored by the Naval Surface Warfare Center Dahlgren Division U S Navy photo by Doug Davant/Released 2009-07-20 090720-N-6148D-001 Navy http //www navy mil/view_image asp id 74261 U S Navy photo by Doug Davant PD-USGov-Military-Navy US 7 inch tractor mounted gun Images from US Navy location Dahlgren Va |