practice had fallen into disuse by the 20th century. Even so, the Department of Defense has stated that large numbers of unofficial medals were privately issued to members of the Armed Forces of the United States for many years after the Civil War, mostly to commemorate specific battles, events, or as private veteran memorabilia. One of the more well known is the Walter Reed Medal (recognized today as a Congressional Gold Medal), awarded for exploratory scientific achievement in the field of malaria treatment. While presented as a gold medallion, members of the military were reported to wear a red ribbon on their uniforms to denote the decoration. Foreign and international awards Foreign and international decorations are authorized for wear on United States military uniforms by the Department of Defense in accordance with established regulations for the receipt of such awards as outlined by the State Department. In the case of foreign decorations, the awards may be divided into senior service decorations (awarded only to high ranking U.S. officers), heroic decorations for valor, and foreign service decorations. There are hundreds of foreign and international awards which have been approved for issuance to United States military personnel since World War I, the following being among the more common. During the First and Second World Wars, the Croix de Guerre medals of France and Belgium, as well as the French Military Medal and Luxembourg War Cross, were further issued as unit citation cords, known as Fourragère. Service members could receive both the individual award and the unit cord; in the case of the later, the unit citation could either be worn temporarily while a member of the unit or permanently if the service member was present during the actual battle which warranted the unit citation. A further unit citation cord of the Order of William of the Netherlands was also issued during World War II, and was far more commonly known as the "Orange Lanyard". As of 2002, South Korea has again issued the Korean Presidential Unit Citation to certain units of the United States Marine Corps, thus placing this previously obsolete foreign award back on the active order of precedence for U.S. decorations. Apart from this one decoration, most 21st century foreign military awards are reserved for only the most senior flag and general officers and then only presented as "end of tour" decorations upon transfer from a major command. See also