The Gap (1937)

This dramatized documentary short film explains "the gap," the areas of British air-raid defense which are unattended due to shortages of manpower. Airmen and gunnery soldiers are told that, while Britain is well-protected against air raids in some areas, there are not enough men manning the searchlights and anti-aircraft guns to cover securely the entire country. A call goes out for volunteers among the civilian and military reserve populations to provide the necessary workforce for adequate protection. Meanwhile, a hypothetical air raid demonstrates the danger of leaving some areas unprotected.