Oesau added four more to his tally by mid-1943. Shortly before his 30th birthday, Oesau was elevated to a series of Luftwaffe staff and administration positions. On 1 July 1943 he was posted as Fighter Leader Brittany (""Jagdfliegerführer" Bretagne"), before being appointed as "Geschwaderkommodore" of JG 1 on 12 November 1943, following the death of JG 1's Hans Philipp in October 1943. The ban on Oesau's combat flying was lifted. While commanding JG 1, Oesau became an expert ("Experten") at shooting down 4 engine bombers, with 14 bomber kills claimed. He was awarded the Combined Pilots-Observation Badge in gold and diamonds on 17 October 1943. He was awarded the German Cross in Gold on 10 January 1944.