Hi,
Don't know if you have this information and if it is interesting for you :
In 1933 he became involved in the Nazi party. Became Reich Youth Leader and so was giving flying training to the Hitler Youth. Also was appointed to the
Präsidium of the German Air Sport League and even was elected to the Reichstag. When the new Lufwaffe was created he returned to it. Fought in the Spanish civil war with the Condor Legion later became of Fighter Squadron 132, which would become the femous Sqdn 26 Schlageter. Became Generallt. 1 September 1943.
If you want more information his military carreer in total I would suggest contacting the Militärgeschichtliches Forschungsamt at Potsdam. Overthere you can sometimes copies of interesting bio's often written for the military only. They have a website. The service is free if you're a researcher.
Best from Regulus