After the war, Hardegen was mistaken for a SS officer with the same last name, and it took him a year and a half to assemble the evidence to convince the Allied interrogators of his real identity.
Setelah perang, Hardegen disangka perwira SS yang nama belakangnya sama, dan butuh satu setengah tahun baginya untuk meyakinkan interogator Sekutu perihal identitas aslinya.