Concomitant to the support provided to Organization Todt during the construction of the "Westwall" by the NSKK, the organization was also tasked by Hitler's chief architect, Albert Speer. He founded a unit known as the "Transport Brigade Speer", which was organized under the auspices of military considerations, dividing them accordingly into regiments, divisions, companies and platoons. On 27 January 1939, Hitler made the NSKK the sole authority for motor-vehicle related military training. Shortly thereafter, the NSKK was divided into 5 main groups and 23 subordinate motor groups. Approximate manpower strength of the NSKK reached nearly half a million men at this stage with its leadership operating primarily out of Munich and Berlin.