Recognition and identification between ground forces and aircraft (RIGFA), 1943 / prepared under the direction of the Chief of the Imperial General Staff and the Chief of the Air Staff, and approved by the Board of the Admiralty. Variant title: Instructions for the use of the combined panel code. Variant title: RAF airfield control signals. Variant title: Royal Air Force airfield control signals. Variant title: Instructions for the use of the combined panel code. Variant title: RAF airfield control signals. Variant title: Royal Air Force airfield control signals.