This picture was already shown in a previous post, but I thought it was interesting to spend a few lines about the Iron Cross, as symbol of the German Army.
The Iron Cross (German: Eisernes Kreuz) is a cross symbol typically in black with a white or silver outline that originated after 1219 when the Kingdom of Jerusalem granted the Teutonic Order the right to combine the Teutonic Black Cross placed above a silver Cross of Jerusalem.
The military decoration called the Iron Cross which existed in the Kingdom of Prussia, and later in the German Empire and Third Reich, was established by King Friedrich Wilhelm III of Prussia and first awarded on 10 March 1813.
The Iron Cross was used as the symbol of the German Army from 1871 to March/April 1918, when it was replaced by a simpler Greek cross. In 1956, the Iron Cross resumed its German military usage, as it became the symbol of the Bundeswehr, the modern German armed forces. (source: wikipedia)