Roderick Gainer, right, Arlington National Cemetery curator, gives a tour of the Memorial Display Room, in between the Tomb of the Unknown Soldier and the Memorial Amphitheater, to by Minister Predrag Matic, Republic of Croatia minister of veterans affairs, and others accompanying him after a wreath-laying ceremony, April 30, 2015, at ANC, Arlington, Va. Dignitaries from all over the world pay respects to those buried at Arlington National Cemetery in more than 3,000 ceremonies each year. (U.S. Army photo by Rachel Larue/Released)