Oskar von dem Hagen

During the First World War, Hagen served as an officer in the German Army as a part of the Feldflieger Abteilung.

Hagen held positions such as Bildoffizier (photo reconnaissance officer) in the Feldflieger-Abteilung 12 and later became the leader of the Feldflieger-Abteilung 7 and Feldflieger-Abteilung 57. His service extended to being the Gruppenführer der Flieger 3 and Gruppenführer der Flieger 1.

For his contributions during the war, he received military honors including both classes of the Iron Cross, the Royal House Order of Hohenzollern with Swords, and other decorations.

After World War I, Hagen transitioned to the Reichswehr.^{[note 1]} He held various positions, including serving in the Abteilung Fremde Heere [de] and later as the commander of the Truppenübungsplatz Neuhammer [de]. In 1935, he joined the Wehrmacht and continued his military career. When the Second World War began, he commanded the Infantry Regiment 376 and was killed in action as a colonel on the Western Front near Ossendrecht, Netherlands on May 17, 1940.

Hagen was posthumously promoted to the rank of Generalmajor, along with receiving Oak Leaves to his Iron Cross posthumously, of which only 95 people ever received after death.^[1]