Leutnant der Flaktruppe Hans Dietrich Riesl (left) and Leutnant des Heeres Lucius Günther Schrivenbach in North Africa, 1941. Their last rank was Oberst. Not much information about Riesl, but Schrivenbach served with Erwin Rommel through the entire Africa campaign and up until 1944, when transferred to Generalfeldmarschall Gerd von Rundstedt’s staff. Please note the Heer tropical unifom with Luftwaffe red (Flak) kragenspiegel worn by Riesl! The first Luftwaffe Flak units in North Africa were kitted out completely with Heer uniforms; Caps, tunics, boots etc. This is because at that stage the Luftwaffe had not completed development or issue of Luftwaffe tropical uniforms. These troops wore the Heer uniform for a few months prior to reissue with the only distinguishing feature being the use of Luftwaffe Flak collar tabs.