This video image provided by the Israel Defense Force purportedly shows one of several Israeli commandos being dropped onto the Turkish-flagged ship Mavi Marmara by helicopter on May 31, 2010. A U.N. panel found that the Israeli blockade of Gaza, where the Turkish ship was headed, is legitimate, although the tactics used in the raid were "excessive and unreasonable." Anonymous/AP hide caption

itoggle caption Anonymous/AP

President Barack Obama pays his respects in the Hall of Remembrance in front of Israel's President Shimon Peres, Israel's Prime Minster Benjamin Netanyahu, Chairman of the Yad Vashem Directorate Avner Shalev and Rabbi Yisrael Meir Lau after marines layed a wreath on his behalf during his visit to the memorial on Friday. Uriel Sinai/Getty Images hide caption

itoggle caption Uriel Sinai/Getty Images