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.
Army Air Forces Gunnery Schools were World War II organizations for training fighter pilots and bomber crewmen at several United States Army Airfields and gunnery ranges (3 schools opened in 1941).
 "Flexible Gunnery" training developed diverse skills for various aircraft and differing positions within bombers, e.g., waist gunner, rear gunner, etc. (fixed gunnery training was used for tbd.)
 "The number of graduates had reached 19,789 by 7 July 1943, with another 57,176 men completing the course by the end of the year."
 For example, at Las Vegas Army Airfield 600 gunnery students and 215 co-pilots were graduated every five weeks at the height of World War II.
 Training started on the ground using mounted shotguns with fixed arcs of fire, and then shotguns mounted on the backs of trucks, which were driven through a course.
 Then the students went up in the bombers, shooting at targets pulled by other aircraft.
Colonel Václav Robert Bozděch (15 July 1912 – 27 February 1980) was a Czech air gunner of World War II.
 He was a British Royal Air Force (RAF) squadron gunner and commander of training centers.
Air Chief Marshal Sir Keith Rodney Park, (15 June 1892 – 6 February 1975) was a New Zealand soldier, First World War flying ace and Second World War Royal Air Force commander.
 He was in operational command during two of the most significant air battles in the European theatre in the Second World War, helping to win the Battle of Britain and the Battle of Malta.
 In Germany, he was supposedly known as "the Defender of London".
Second Lieutenant Arthur Rex Hurden Noss {'1': ", '2': ", '3': ", '4': "} (22 January 1897 – 15 September 1917) was a British World War I flying ace credited with nine aerial victories.
 He won a Military Cross as Keith Park's gunner, and was killed in a flying accident shortly thereafter.
The Scarff ring was a type of machine gun mounting developed during the First World War by Warrant Officer (Gunner) F. W. Scarff of the Admiralty Air Department for use on two-seater aircraft.
 The mount incorporated bungee cord suspension in elevation to compensate for the weight of the gun, and allowed an airgunner in an open cockpit to swivel and elevate his weapon (a Lewis machine gun) quickly, and easily fire in any direction.
 Later models permitted the fitting of two Lewis guns; while this doubled the firepower available, operation of the paired guns was more cumbersome, and required considerable strength from the gunner, especially at altitude, so that many gunners preferred the original single gun - and this became the postwar standard.
 In either case, the mounting was simple and rugged, and gave its operator an excellent field of fire.
 It was widely adapted and copied for other airforces.
Flight Lieutenant Wallace McIntosh DFC & Bar, DFM (27 March 1920 – 4 June 2007) flew 55 bombing missions with the RAF during the Second World War as an air gunner in Lancaster bombers.
 He was recognised as the most successful air gunner in Bomber Command, having shot down eight enemy aircraft (7 were shared with M/U Gunner Larry Sutherland) two "probables" and one "damaged" (also shared with Sutherland).
 In one operation on the day after D-Day, they shot down three German night fighters.
The Boeing B-29 Superfortress is a four-engine propeller-driven heavy bomber designed by Boeing, which was flown primarily by the United States during World War II and the Korean War.
 It was one of the largest aircraft operational during World War II and featured state of the art technology.
 Including design and production, it was the single most expensive weapons project undertaken by the United States in World War II, exceeding the cost of the Manhattan Project by between $1 and 1.7 billion.
 Innovations introduced included a pressurized cabin, dual-wheeled, tricycle landing gear, and an analog computer-controlled fire-control system that directed four remote machine gun turrets that could be operated by a single gunner and a fire-control officer.
 A manned tail gun installation was semi-remote.
 The name "Superfortress" continued the pattern Boeing started with its well-known predecessor, the B-17 Flying Fortress.
 Designed for the high-altitude strategic bomber role, the B-29 also excelled in low-altitude nighttime incendiary bombing missions.
 One of the B-29's final roles during World War II was carrying out the atomic bomb attacks on Hiroshima and Nagasaki.
A nose gunner or front gunner is a crewman on a military aircraft who operates a machine gun or autocannon turret in the front, or "nose", of the airplane.
 This position could be manned by someone who was a dedicated gunner, however, it was more common for him to have a dual role, the gunnery being a secondary position (i.e. his primary task is navigator, bombardier, most commonly).
 This is different from fixed guns mounted in the nose and fired by the pilot or co-pilot, since those do not require a nose gunner.
 Manned nose guns were most common during WWI and World War II, employed by both Allied and Axis forces.
 Early in WWI, nose-gunners enjoyed a period of popularity on pusher-engined fighters; a gunner would be stationed in the nose, covering the arc ahead of the aircraft.
 Once the synchronizer was invented, allowing a fixed machine gun to fire through the propellor, the pusher-engined fighter fell into disuse, although nose guns were still commonly seen on multi-engine bomber aircraft.
The Hannover CL.II was an escort fighter, produced in Germany during World War I, designed in response to a 1917 requirement by the "Idflieg" for such a machine to protect reconnaissance aircraft over enemy territory.
 It was a compact biplane of largely conventional configuration with single-bay staggered wings of unequal span.
 The fuselage was a thin plywood paneled, wooden monocoque design, very similar to the style of fuselage in Robert Thelen's Albatros series of single-seat fighters.
 The main units of the fixed tailskid undercarriage were linked by a cross-axle, and the pilot and tail gunner sat in tandem, open cockpits, with the gunner's cockpit elevated above the line of the upper fuselage to afford him a greater field of fire.
 For the same purpose, the aircraft featured an unusually compact empennage, with a short fin integral with the rear fuselage structure and a biplane tail unit that allowed the rear gunner to have a larger field of aftwards fire when defending the aircraft.
 Smaller than the usual C-class reconnaissance aircraft, it was easy for enemy pilots to mistake it for a single-seat fighter; a mistake that would bring them into the line of fire of the rear-facing dorsal gunner when closing from astern.

Question: What did a  gunner of the "the Defender of London  win in World War I?
Answer: Military Cross