The Luftwaffe was created from the outset for active offensive actions. The core of their strike potential consisted of bomber squadrons, which were organized into bomber groups, and the groups, in turn, were part of bomber wings. A typical airfield where a Luftwaffe bomber group was based included runways, parking areas, refueling and servicing points for bombers, accommodations for aircrew and ground personnel, ammunition depots, headquarters, and a flight control center, as well as communication facilities. The airfield perimeter could be fenced and equipped with checkpoints and barriers, and for security purposes, the area surrounding the airfield might be mined. Overall, the ground service in the Luftwaffe was well-organized, which in turn allowed for the effective deployment of bomber group aircraft throughout the entire period of World War II.