Feldgrau (field grey) was the color of the field uniform of the German Army from late 1907 until 1945, and the East German NVA armies. Metaphorically, Feldgrau used to refer to the armies of Germany (the Imperial German Army and the Heer [army] component of the Reichswehr and the Wehrmacht).
The word feldgrau means "field grey", and by World War I the color was a light grey-green, though there is no specific color, rather a color range of greys to browns, that was one of the first standardized uniforms suitable to the age of smokeless gunpowder. Formerly, the Germans wore a Prussian blue shade similar to that of the French.
Sweden used a very similar color for infantry uniforms, for example the grey m/1923 and later on grey-green as the German ones. The last uniform to use the color was the woollen m/58 winter uniform.
The Chilean Army also wears a full dress uniform in Feldgrau.
The original article can be found at Feldgrau and the edit history here.