The Spanish Army (which had not been involved in the First World War) exceptionally continued to issue coloured uniforms to all its conscript rank and file until 1926 and thereafter to the garrisons of Seville, Barcelona and Madrid for special ceremonials until 1931. These included red trousers for the line infantry, following the French practice in an example of cross-border influence. The use of steel helmets was by now almost universal and a number of countries adopted their own designs moving away from the German, British and French models of the First World War. The Italians, Soviets, Japanese, Swiss, Spanish and Portuguese were amongst these. Steel helmets, originally simply items of utilitarian protective clothing, were adopted as parade headdress by the French, German, Italian and Soviet armies, amongst others, between the Wars. Uniforms of varying shades of khaki and grey were universal in the Second World War but the cut and outline appearance of the different armies still made identification in the field relatively straight forward. A Soviet soldier would, for example be distinguishable from his German opponent by his general outline, even in the fog of battle. British, American, Japanese and French uniforms still retained some distinctive features, even as they became more and more utilitarian in the course of the War. The US Army discarded its First World War style field uniforms in 1941 in favour of a very plain and practical combat dress in a thin light brown wool shirt (sometimes with an olive green cast) and slightly darker trousers. This was worn in conjunction with a smart olive drab "Class A" dress uniform—which in many cases varied to a rich "chocolate" brown tunic worn with khaki trousers. There was a khaki version of the Class A dress uniform for summer wear (See United States Army Uniform in World War II). The war started with American combat troops wearing combat shoes with "spats" (a form of gaiters), replaced later in the war with 2-buckle combat boots. By contrast, British soldiers, other than officers, had their 1938 battledress for all occasions. In Germany the Nazi regime retained uniforms with many traditional features from Imperial Germany for its army uniforms, such as field grey cloth, marching boots (a taller version for officers), collar litzen (braiding) and breeches (for officers and NCOs); German Panzer (tank) troops had a special combat uniform made of black wool and German troops serving in tropical climates had uniforms in a shade of khaki. Later in the war, severe leather shortages led to the replacement of marching boots with ankle height shoes worn with gaiters (Gemäsch).