Black
Black is the darkest color, the result of the absence or complete absorption of visible light. It has been a traditional color of cavalry and armoured or mechanized troops. German armoured troops (Panzerwaffe) traditionally wore black uniforms, and even in others, a black uniform is common. In Finland, black is the symbolic color for both armoured troops and combat engineers, and military units of these specialities have black flags and unit insignia.
Black uniform were used by Hussars and Black Brunswickers, the German Panzerwaffe, and U.S. 400th Missile Squadron, and continues in use with the Estonian Kuperjanov Battalion.