Vintage from the 1910s. This is an authentic extremely rare World War I U. Insignia button of the U. The Tank Corps of the American Expeditionary Forces was the mechanized unit that engaged in tank warfare for the American Expeditionary Forces (AEF) on the Western Front during World War I. Lieutenant Colonel George S. Patton, pictured here in France, in the summer of 1918, standing in front of a French Renault tank. Please see info about the U. This website shows a photo which you can use for comparison.