Mezue ahịrịokwu na-esonụ: Amụrụ na Schrimm na Province nke Posen, Wilcke wepụtara onwe ya maka ọrụ agha na "Reichswehr" nke Third Reich na 1934. Na mbụ na-eje ozi na "Heer" (Army), a kpọfere ya na Luftwaffe (Air Force) na 1935. Mgbe ọ gụsịrị ọzụzụ ụgbọelu, e zigara ya na "Jagdgeschwader" "Richthofen" (Fighter Wing "Richthofen") n'April 1936. Mgbe e kenyere ya ọrụ dị ka onye nkuzi ụgbọelu na-alụ ọgụ, ọ wepụtara onwe ya maka ije ozi na Condor Legion n'oge Agha Obodo Spanish na mbido 1939. Mgbe ọ lọtara na Spain, a họpụtara ya "Staffelkapitän" (onye isi ndị agha) nke 7. "Staffel" (7th squadron) nke "Jagdgeschwader" 53 (JG 53<unk>53rd Fighter Wing). Mgbe Agha Ụwa nke Abụọ tiwapụrụ, o kwuru na ya bụ mmeri mbụ ya na 7 Nọvemba 1939. N'abalị iri na asatọ nke ọnwa Mee n'afọ 1940, n'oge Agha France, e gburu ya ma jide ya n'agha. Mgbe ndị
nkwekọrịta agha na France, ọ lọtara site na njide ma họpụta ya "Gruppenkommandeur" (onye isi otu) nke III. "Gruppe" (3rd group) nke JG 53 n'oge Agha Britain, na-ekwu na mmeri 10 na England.