Luftwaffe Field Divisions and Paratrooper Regiments () under the Luftwaffe. He eventually included a tank regiment (Fallschirm-Panzer Division), Flak units and a signals regiment () under the Luftwaffe umbrella. Formation and expansion During the 1930s and 1940s, air power had not matured enough to be considered a dominant weapon of war. Unlike the other two forces, air power did not have past experience to draw upon. This resulted in the air force having to learn from experience rather than the classroom. There were no cohesive ideas for the organization of a structured, modern air force. One train of thought subordinated the air force to the army in support of land operations and to the navy for maritime tasks. It would be staffed by soldiers or sailors trained to fly. The second theory envisioned a centralized, well organized air force to be used as a weapon of war, like the army and navy. German aviators from World War I, followed this thought process. Since they had the backing of the German political leadership, this is how the Luftwaffe was originally conceived and formed. Following the tradition of putting a soldier in charge of the army and a sailor in charge of the navy, an aviator was designated to lead the Luftwaffe: Reichsmarschall Hermann Göring, also the cabinet minister for aviation. Göring formed a Luftwaffe High Command () for operational management. Within the German air force leadership, the general opinion was that the Luftwaffe was a tactical rather than a strategic air force. Hence, in order to support the various army groups, the Luftwaffe was organized in similar fashion to the army. Its units had a flexible composition with sub-units being added or removed when necessary. These sub-units tended to be semi-autonomous and highly mobile. This offered the flexibility required to support the ground units. From the start of the Spanish Civil War, the Luftwaffe was in action continuously without the time for rest or training. Multiple political acts and the consequent need for a show of strength forced the Luftwaffe to be in a perpetual state of readiness. This did not allow time for organizational strategy. Göring complicated the hierarchy by bringing the paratrooper () and Flak corps (anti-aircraft units) under his command. Due to his political differences with the army leadership, he raised his own police force as Prussian Minister of the Interior. This later became the Paratroop Tank Corps