A group of U.S. Army veterans who took part in liberating Nazi death camps walk through the entrance gate of the former Nazi Death Camp Auschwitz-Birkenau, in Oswiecim, southern Poland, Thursday, April 19, 2012, as they take part in the annual March of the Living to commemorate Holocaust victims. Walking with the flag is Frederick Carrier, one of the U.S. soldiers who helped liberate Buchenwald. (AP Photo/Alik Keplicz)