Tattooed arms from prisoners of Nazi concentration camps. The numbers replaced their names while at the camps. They were tattooed on so that they could be easily tracked by the Germans. This is why we study history. So this never happens again.
American author Ernest Hemingway in dressed in the uniform of an ambulance driver for the International Red Cross during World War I, where he was stationed on the Italian front. (He almost looks like Yon Gonzalez in this photo.