skies, making a light base color effective for night fighters against sometimes cloudy or foggy skies below the night fighters' usual combat altitudes. Reconnaissance and maritime aircraft operating over the North Sea tended to paint the underside light blue and the top side in a dark gray or dark green to resemble the sea. By 1943, as economic conditions tightened, front line units used captured allied paint where available. Central control over camouflage relaxed even further. Later-deployed examples of both night fighters defending the Reich, and Heinkel He 177 heavy bombers used for night raids over England such as with Operation Steinbock, often returned to using flat black undersurfaces replacing the light blue previously used during the mid-war years, while retaining the skyglow-based light gray base color/darker gray "wave-mirror" irregular lines or irregular splotches on the upper surfaces. With units disbanding and reforming frequently, intricate patterns became less common. Dark green became more or less the standard. With deteriorating conditions and scarce supplies, various motley color schemes were used. This changed only for those day fighter and "destroyer" units that flew as part of the Defense of the Reich (Reichsverteidigung) campaign. Later in 1944 these units adopted the pattern of a distinct color band, or two-colored bands, around the aft fuselage, with each Geschwader usually having their own unique combination. Day fighter units Single engine fighter units used chevrons to represent the pilot's rank or seniority. Bars, points or crosses to represent the Gruppe to which it belonged, and a number representing the Jagdgeschwader were also utilized. The Geschwaderkommodore of a fighter geschwader was represented by two chevrons and a vertical bar. The Gruppenkommandeur was represented by two chevrons; while a Gruppe Technical Officer would have a single chevron and a circle. The Geschwader abbreviation such as JG 11, ZG 110 was also applied. For a staff pilot, there would be a thick black line all around the aircraft. Some day fighter units also used geometric patterns of alternating black and white horizontal stripes on the engine cowling, or checkerboard patterns, also on the cowling. During the Defense of the Reich campaign, there was a general adoption of a system of colored rear fuselage bands, with unique combinations assigned to each Jagdgeschwader engaged in the campaign. Use of these colored fuselage bands was generally abandoned by mid-1944. At one point, a color scheme that painted the rudder in white, similar