Keywords: US Navy 100506-N-7676W-012 Lt. Dong Park explains how a fuel cell vehicle works during Public Service Recognition Week on the National Mall in Washington, D.C.jpg en WASHINGTON May 6 2010 Lt Dong Park assigned to the Office of Naval Research science and technology reserve component explains how a fuel cell vehicle works during Public Service Recognition Week on the National Mall in Washington D C U S Navy photo by John F Williams/Released 2010-05-06 100506-N-7676W-012 Navy http //www navy mil/view_image asp id 85172 U S Navy photo by John F Williams PD-USGov-Military-Navy Military in Washington D C |