Von Falkenhausen believed that it was too optimistic to expect the National Revolutionary Army (NRA) to be supported by armor and heavy artillery because the industry lacked the necessary capacity. Thus, he emphasized the creation of a mobile force that relied on small arms and would be adept with infiltration tactics, like those of the German stormtroopers around the end of World War I. German officers were called into China as military advisers, like Lieutenant Colonel Hermann Voigt-Ruscheweyh, who acted as adviser to the Artillery Firing School in Nanking from 1933 to 1938.