Keywords: US Navy 110620-N-ZB612-023 Chief of Naval Operations (CNO) Adm. Gary Roughead delivers remarks during the 4th Symposium on the Impacts of an Ice-Di.jpg en WASHINGTON June 20 2011 Chief of Naval Operations CNO Adm Gary Roughead delivers remarks during the 4th Symposium on the Impacts of an Ice-Diminishing Arctic on Naval and Maritime Operations at the U S Navy Memorial in Washington D C U S Navy photo by Chief Mass Communication Specialist Tiffini Jones Vanderwyst/Released 2011-06-20 110620-N-ZB612-023 Navy http //www navy mil/view_image asp id 102843 U S Navy photo by Chief Mass Communication Specialist Tiffini Jones Vanderwyst PD-USGov-Military-Navy United States Navy Memorial |