A guest drops a flower into the oil-stained waters at the USS Arizona Memorial during the 73rd Anniversary Pearl Harbor Day commemoration ceremony at the Pearl Harbor Visitor Center. More than 2,000 guests, including Pearl Harbor survivors and other veterans, attended the National Park Service and U.S. Navy hosted joint memorial ceremony at the World War II Valor in the Pacific National Monument. This year's theme focused on "Preserving the Memory." (U.S. Navy photo by Mass Communication Specialist 2nd Class Laurie Dexter/Released)