US President Barack Obama (R) and Japanese Prime Minister Shinzo Abe shake hands after laying wreaths at the Hiroshima Peace Memorial Park in Hiroshima on May 27, 2016. (JIM WATSON/AFP/Getty Images)
Sinking hit British battlecruiser 'Indefatigable' shortly before its explosion on May 31st, 1916 - tempera painting by Willy St?wer 1916. (Willy St?wer/ullstein bild via Getty Images)
Members of the 3rd U.S. Infantry Regiment place American flags at the graves of U.S. soldiers buried in Section 60 at Arlington National Cemetery in preparation for Memorial Day May 24, 2012 in Arlington, Virginia. (Win McNamee/Getty Images)
Royal Australian Navy warships HMAS Darwin (R) and HMAS Parramatta enter Sydney Harbour on October 4, 2013 in Sydney, Australia. (Cameron Spencer/Getty Images)