 He was taken to the depot of the Panzergrenadier training battalion of the "Leibstandarte Adolf Hitler" division of the SS (Stammkompanie SS-Panzer-Grenadier-Ausbildungs-and-Ersatz Bataillon 1), where he spent the next six months working for the Feldjägerkorps.After the war, Cooper was tried for high treason at the Central Criminal Court in January 1946, and sentenced to hang.An appeal failed, but days before his scheduled execution, the sentence was commuted to life imprisonment "on the grounds that [he] had been [a follower] in treason rather than [a leader]."