Could it be Walter Hagen?
https://de.wikipedia.org/wiki/Walter_Hagen_(Pilot)
HAGEN, Walter Adolf Christian. (DOB: 16.03.97 in Kiel). (RE). 19.05.15 entered the Heer. 1915 volunteered for Husarenregiment 13. WWI served with the Seeflieger, rising to Hauptwachtmeister. 23.11.17 began pilot training with I. Seeflieger-Abt. 31.05.18 training with the Flieger-Fortbildungs-Schule Holtenau. 07.07.18 training at the Kampfeinsitzerschule Putzig. 02.08.18 trf to the Kommando der Flieger beim Marinekorps Flandern. 01.09.24 pilot for Junkers Luftverkehr (to 28.02.26). 1924 with Severa (to 30.06.28). 1924 joined the Stahlhelm (to 1926). 01.03.26 worked for the Severa company. 01.07.28 became a Flugkapitän for the German airline industry and as a test pilot for the test establishments at Travemünde und Rechlin. 01.04.35 entered the Luftwaffe with a rank of Hptm. (RDA 01.05.35) and attended Infanterie Lehrgang in Königsbrück. 01.06.35 trf to Erprobungsstelle Travemünde and appt flight operations director for the testing of aircraft there.
01.04.36 trf to RLM and appt Referent für Flugsicherheit. 01.01.38 appt Staka of Erprobungs-u.Lehrstaffel (See). 01.02.38 promo to Maj. 15.09.39 appt Kdr. I.(St.)/Tr.Gr. 186 (to 02.07.40).
22.06.40 appt Kommodore St.G. 1. 01.07.40 promo to Obstlt. 21.07.40 Maj., awarded Ritterkreuz, Kdr. III./St.G. 1. 17.02.42 Obstlt., awarded Eichenlaub, Kommodore St.G. 1. 01.04.42 promo to Oberst. 10.08.42 awarded Ehrenpokal. 01.01.43 appt provisional Fliegerführer 1 (Luftflotte 1 (to 15.01.43). 15.01.43 appt provisional Fliegerführer 1 (Tunisia) (to 30.03.43). 15.03.43 appt provisional Fliegerführer 3 (Gabes). 09.04.43 Oberst, Fl.Fü. 3 injured in Fi 156 crash at Grambalia in Tunisia and sent to hospital in Kiel. 24.06.43 in Frontflieger-Sammelgruppe, trf to Führerreserve Ob.d.L. 17.09.43 ordered to Lw.-Kdo. Südost for temporary duty. 09.43 appt Fliegerführer Albanien (to 13.06.44). 30.04.44 concurrently appt Fliegerführer Kroatien (to 29.08.44). 01.07.44 promo to Gen.Maj. 29.08.44 appt Fliegerführer Nordbalkan (to 31.01.45). 01.02.45 appt Kdr. 17.
Fliegerdivision (to 08.05.45). 08.05.45 became American POW. 1947 released from U.S. custody. †24.11.63 in Kiel following a long illness. Credited with sinking 210,000 GRT of shipping and damaging another 306,500 GRT.
(Source: De Zeng and Stankey)