In the concept of Blitzkrieg, which was a key reason for the success of the German army in World War II, aviation played one of the leading roles. The effective actions of the Luftwaffe largely determined the success of the offensive operations of ground units. The numerous air forces of Germany required a developed network of airfields that could provide quality maintenance of aviation equipment. A typical Luftwaffe airfield included a headquarters or flight control center, runways, aircraft parking areas, refueling stations, ammunition depots, and repair zones. The personnel of military airfields consisted of pilots, technical staff, meteorologists, communication operators, logistics units, security forces, and anti-aircraft gunners. The perimeter of the airfield could be mined, and a command checkpoint with a barrier was set up for access to the territory.