In this Tuesday, April 2, 2013 photo a World War II era 

In this Tuesday, April 2, 2013 photo a World War II era photo of U.S. Army medic Donald Johnson, top, lies next to a 1945 photograph taken by Johnson that shows a boy in what is believed to be the Nazi Mauthausen concentration camp, at the home of filmmaker Matthew Nash, in Boston. Nash's discovery of photographs by Johnson, his grandfather, led him to create a documentary about the liberation of the Ohrdruf concentration camp in Germany, the first that the Americans found. (AP Photo/Steven Senne)
Associated Press
In this Tuesday, April 2, 2013 photo a World War II era photo of U.S. Army medic Donald Johnson, top, lies next to a 1945 photograph taken by Johnson that shows a boy in what is believed to be the Nazi Mauthausen concentration camp, at the home of filmmaker Matthew Nash, in Boston. Nash's discovery of photographs by Johnson, his grandfather, led him to create a documentary about the liberation of the Ohrdruf concentration camp in Germany, the first that the Americans found. (AP Photo/Steven Senne)
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