Between 8 September 1943 and the end of the war, Italian Military Internees were confronted daily with a stark choice between continued resistance and opting to assist the Reich by fighting or working. Extraordinarily, over 600,000 said no, and endured internment or forced labour until they were liberated or died. Paradoxically, the minority who made the more predictable choice of opting to cooperate, the so-called optanti, constituted an anomaly. This article examines their motivation by giving an overview of the political background, the experience of deportation, the Lager environment and the phases and methods of propaganda. Primary sources indicate that hunger was a common denominator in their decision, but that the weight of other factors, which varied with individuals, broadly speaking fell into three categories: bleak honesty, specious cynicism and maverick idealism. These categories are illustrated by four case studies: the mass adhesion at Biala Podlaska and the individuals Pietro Faraci, Tranquillo Frigeni and Remo Faustini.