to 1935, civilian aircraft were painted with a bright red horizontal band with a black swastika in a white circle superimposed, shown only on the vertical stabilizer. From 1936, the Balkenkreuz (national cross with four equal arms), basically inherited from the early spring 1918 period of Luftstreitkräfte service when it first appeared in World War I, was applied in black and white, with somewhat different proportions (one-quarter as wide as its length from end-to-end) than the WW I-period insignia, and without the white border outlining the "ends" of the cross, the white borders forming four right-angled "flanks" around the central black core cross. It was painted on the fuselage about halfway between the wing and the tail and on the upper and lower sides of each wing. The flanks came in two regulation dimension formats, with much narrower flanks before July 1939 used in all six positions on an airframe — a wider-flanked variation, for use underneath wings and on the fuselage sides, came into use from July 1939 onwards. This helped in immediate identification. During the Spanish Civil War, where the Luftwaffe participated through the Condor Legion, aircraft were repainted with a white Andrea's Cross in a black circle. The tail was all white with Andrea's Cross on the rudder. In Germany itself, the Balkenkreuz was once again used as the national insignia on the fuselage and wings in six locations, initially with a very narrow set of four white "flanks", which were widened around 1938–39, with the usual swastika on the vertical tail surfaces, usually on the fixed fin, but sometimes instead on the rudder (as done on some Arado-designed aircraft) and on airframe designs that either had a small fin or one braced with struts. Medical aircraft were painted with a red cross on a white circular background. Later on in the war when camouflage was more necessary, the Balkenkreuz had only a white or black outline in a "low-visibility" format, consisting only of the four right-angle "flanks" that had previously bordered the now-absent central black core cross of the Balkenkreuz, with the swastika also frequently being done with a white or black border only, omitting the central black shape. Production examples of the Heinkel He 177, however, curiously most often came from the Heinkel and subcontracting Arado factories with a set of Balkenkreuz insignia, most often the upper-wing narrow flank variant used as standard for all