German re-armament
Despite its scale, German re-armament remained a largely covert operation, carried out using front organizations such as glider clubs for training pilots and sporting clubs, and Nazi SA militia groups for teaching infantry combat techniques. Front companies like MEFO were set up to finance the rearmament by placing massive orders with Krupp, Siemens, Gutehofnungshütte, and Rheinmetall for weapons forbidden by the Treaty of Versailles.