Petroleum includes storage, synthetic oil and associated plants.

Communicatins covers rail, road and water transport systems.

German Air Force includes aero-engine and aircraft factories, depots and airfields.

Military installations covers storage depots, V-weapon sites, etc.

Specific Industries include vehicles, chemicals, rubber, tanks, vehicles, bearings, etc.

Army Support covers tacticals missions against troop concentrations, defensive positions, etc.

The RAF area bombing campaign was against industrial cities with war industries and transportation centres. The area bombing campaign developed because Bomber Command couldn't carry out precision attacks at night.