The primary function of the German Field Police was traffic control and orderly direction of both soldiers and materials with regard to regulations and discipline. This was especially so with large troop movements, bad conditions and heavy supply route traffic. The Feldgendarmerie were known as 'Kettenhunde', "chained dogs". As a military organization they had received full infantry training and also had extensive police powers (source: www.grenadier352nd.com/html_pages/feldgendarmerie).

The cap is claimed to have belonged to the Gestapo officer Siegfried Wolfgang Fehmer (1911 - 1948). As a member of Abteilung IV in Oslo Fehmer wore an SS uniform with Sicherheitsdienst badges, and apparently he made a dashing figure walking around Oslo with his german shepherd by his side. Fehmer had a reputation for being a charming person, and he was perceived as quite the ladies man. Despite this outward appearance, Fehmer was capable of displaying severe psychopathic characteristics. Fehmer did not hesitate to use torture to get answers from suspects, and the Milorg (the military branch of the Norwegian resistance movement) saw him as a severe threat to them. Several plans for his assassination were made. Fehmer survived one such attack with several gunshot wounds to his chest. After the war ended on the 8th of May, 1945, Fehmer made an unsuccessful dash for freedom, fleeing towards Sweden but he was arrested by Norwegian police officers. He was tried and convicted of war crimes, and sentenced to death by the Supreme Court of Norway. Fehmer was subsequently executed by firing squad at Akershus festning on the 16th of March, 1948.