Weber knew Austria well, and because he was actually from a town in Tyrol, he knew they would have at least some civilian help in the heavily pro-Nazi area. Weber was chosen by Mayer and Wijnberg after they found and questioned him at a German POW camp. With him were Hans Wijnberg, a Dutch-American OSS agent he had been alongside since basic training, and Franz Weber, a former Wehrmacht officer who had deserted (due to having a conscience). Ultimately, being more propaganda and rumor than anything else, the Redoubt was rumored at the time to be an “impenetrable fortress” being constructed to aid Nazi Germany and prolong the war. Operation Greenup focused on Tyrol, a region within the Alps of Western Austria, and had two main objectives: to monitor the railway system in the Brenner Pass (the main supply route between northern Germany and Italy), and to gather intel on the Alpine Redoubt.
