Question: The Radio Operator & Air Gunner's Badge, is a commonly accepted title for the German title, translated into English,Combined Air Gunner, Radio Operator and Flight Engineer Badge, it was a German military decoration awarded to radio operators, air gunners and mechanics (flight engineers) who were members of the German Air Force, translated into what in German, a flight engineer (FE), also sometimes called an air engineer, is the member of an aircraft's flight crew who monitors and operates its complex aircraft systems?
Context: Amateur radio or ham radio is practised by more than 16,000 licensed users in India.  The first amateur radio operator was licensed in 1921, and by the mid-1930s, there were around 20 amateur radio operators in India.  Amateur radio operators played an important part in the Indian independence movement with the establishment of illegal pro-independence radio stations in the 1940s.  The three decades after India's independence saw only slow growth in the numbers of operators until the then Prime Minister of India and amateur radio operator, Rajiv Gandhi (VU2RG), waived the import duty on wireless equipment in 1984.  Since then, numbers have picked up, and as of 2007 , there were more than 16,000 operators in the country.  Amateur radio operators have played a vital role during disasters and national emergencies such as earthquakes, tsunamis, cyclones, floods, and bomb blasts, by providing voluntary emergency communications in the affected areas. The Radio Operator & Air Gunner's Badge (German: "Fliegerschützenabzeichen für Bordfunker" ) is a commonly accepted title for the "Luftwaffen-Fliegerschützen-Bordfunker-und Bordmechanikerabzeichen" (Combined Air Gunner, Radio Operator and Flight Engineer Badge).  It was a German military decoration awarded to radio operators, air gunners and mechanics (flight engineers) who were members of the German Air Force (Luftwaffe) after they completed two months training or had taken part in at least five operational flights.  If wounded during an operational flight, the badge could be awarded and worn earlier.  Later in June 1942, a separate badge was introduced for Air Gunners and Flight Engineers.  That badge had the same qualifications. An air gunner (AG) also known as "aerial gunner" is a member of an air force aircrew who operates flexible-mount or turret-mounted machine guns or autocannons in an aircraft.  Modern aircraft weapons are usually operated automatically without the need for a dedicated air gunner, but older (World War II and earlier) generation bombers used to carry up to eight air gunners. The Flight Engineer Badge was a qualification badge of the United States Army Air Forces authorized late in the Second World War on 19 June 1945.  It was awarded to those military officers and NCOs who had qualified as flight engineers on board a military aircraft.  As aircraft grew increasingly complex, the need arose for an in-flight specialist dedicated to monitoring and operating the various systems.  However, prior to the creation of their own distinctive wings, flight engineers wore aircrew wings. The Flyer's Commemorative Badge (German: "Flieger-Erinnerungsabzeichen" ) was a German military decoration awarded to active and reserve personnel who had been honorably discharged from flying duties.  Luftwaffe (air force) personnel qualified for the badge after having served as flyers for four years during World War I or had been honorably discharged after 15 years of flight duty service.  However, one could also qualify for the badge if they became disabled due to a flying accident.  If one was killed during the course of his flying duties, the badge was given to their next of kin.  The badge is commonly known as the "Retired Aircrew Badge".  It was awarded prior to 1 September 1939, the start of World War II in Europe.  It is considered one of the most rare flying qualification awards. The Air Gunner's and Flight Engineer's badge (German: "Fliegerschützenabzeichen für Bordschützen und Bordmechaniker" ) was a German military decoration awarded to air gunners, mechanics (flight engineers) or aircrew meteorologists who were members of the German Air Force (Luftwaffe) after they completed two months training or had taken part in at least five operational flights.  If one was wounded during an operational flight, the badge could be awarded earlier.  For Luftwaffe members who were air gunners and mechanics (flight engineers) this badge replaced an earlier separate badge which had been introduced back in 1935.  The qualifications for the two badges were the same for recipients. A radio operator refers to a person who is responsible for the operations of a radio system.  The profession of radio operator has become largely obsolete with the and automation of radio-based tasks in recent decades.  Nevertheless, radio operators are still employed in maritime and aviation fields.  In most cases radio transmission is now only one of several tasks of a radio operator.  In the United States, the title of Certified Radio Operator is granted to those who pass a test issued by the Society of Broadcast Engineers. The Observer's Badge (German: "Beobachterabzeichen" ) was a German military decoration that was awarded before and during World War II to members of the German Air Force (Luftwaffe).  They qualified for the badge after completing two months of qualifying service and five operational flight's in the role of observer, navigator or bombardier; also, it could be awarded after a member of the German Air Force was wounded while acting in the capacity of an observer during a qualifying flight.  It was worn on the left breast tunic pocket of an air force or political uniform tunic.  A citation was issued with the awarded badge.  Thereafter, Luftwaffe service personnel who had already been awarded the Pilot's Badge and Observer's Badge could qualify for the Pilot/Observer Badge.  After 31 July 1944 the regulations were changed and the recipient had to have held both qualification certificates for at least one year to qualify for the Pilot/Observer Badge. A flight engineer (FE), also sometimes called an air engineer, is the member of an aircraft's flight crew who monitors and operates its complex aircraft systems.  In the early era of aviation, the position was sometimes referred to as the "air mechanic".  Flight engineers can still be found on some larger fixed-wing airplanes, and helicopters.  A similar crew position exists on some spacecraft.  In most modern aircraft, their complex systems are both monitored and adjusted by electronic microprocessors and computers, resulting in the elimination of the flight engineer's position. The Aircrew Badge (German: "Fliegerschaftsabzeichen" ) was a German military decoration awarded to members of the German Air Sports Association ("Deutscher Luftsportverband" or DLV e. V.), an organisation set up by the Nazi Party in March 1933 to establish a uniform basis for the training of military pilots.  The German Air Sports Association was a cover organization for the future German Air Force (Luftwaffe).  Its chairman was the future Commander in Chief of the Luftwaffe Hermann Göring and its vice-chairman Ernst Röhm.  Since the Treaty of Versailles officially forbade Germany from building fighter planes of any sort, the German Air Sports Association used gliders to train men who were still officially civilians for the future Luftwaffe.  It was the first qualification badge recognized by the Luftwaffe.
Answer: Luftwaffe