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|A Sopwith Cuckoo dropping an aerial torpedo during World War I|
A torpedo bomber is a military aircraft designed primarily to attack ships with aerial torpedoes. Torpedo bombers came into existence just before the First World War almost as soon as aircraft were built that were capable of carrying the weight of a torpedo, and remained an important aircraft type until they were rendered obsolete by anti-ship missiles. They were an important element in many famous Second World War battles, notably the British attack at Taranto and the Japanese attack on Pearl Harbor.
Torpedo bombers first appeared immediately prior to the First World War. Generally, they carried torpedoes specifically designed for air launch, which were smaller and lighter than those used by submarines and surface warships. Nonetheless, as an airborne torpedo could weigh as much as 2,000 pounds (910 kg), more than twice the bomb load of contemporary single-engined bombers, the aircraft carrying it usually needed to be specially designed for the purpose. Many early torpedo bombers were floatplanes, such as the Short 184 (the first aircraft to sink a ship with a torpedo), and the undercarriage had to be redesigned so that the torpedo could be dropped from the aircraft's centerline.
While many torpedo bombers were single-engine aircraft, some multi-engined aircraft have also been used as torpedo bombers, with the Mitsubishi G3M Nell and Mitsubishi G4M Betty being used in the sinking of Prince of Wales and Repulse. Other twin-engine aircraft designed or used as torpedo bombers are the Mitsubishi Ki-67, the Savoia-Marchetti SM.79 "Sparviero" (three-engined), the CANT Z.1007, the Bristol Beaufort and Bristol Beaufighter ("Torbeau"), the Junkers Ju 88, the Heinkel He 111, the B-25 Mitchell and many others.
Some postwar jet aircraft (such as the Ilyushin Il-28T) were adapted as torpedo bombers in the late 1940s and 1950s. The last known torpedo bomber attack was made by US Navy Skyraiders against the Hwacheon Dam during the Korean War. The North Korean Air Force finally retired the world's last operational torpedo bombers in the 1980s.
In a parallel development, many maritime strike aircraft and helicopters have been capable of launching guided torpedoes; however, they are not generally referred to as torpedo bombers because of their vastly greater detection and tracking capabilities, although they remain just as capable of making attacks on surface ships as against submarines.
Many naval staffs began to appreciate the possibility of using aircraft to launch torpedoes against moored ships in the period before the First World War. Captain Alessandro Guidoni, an Italian naval captain, experimented with dropping weights from Farman MF.7 in 1912. which led to Raúl Pateras Pescara and Guidoni developing a purpose-built torpedo bomber from which an 375 lb dummy torpedo was dropped in February 1914 but they abandoned their work shortly afterwards when the aircraft's performance proved inadequate. Admiral Bradley A. Fiske of the United States Navy took out a patent in 1912 for a torpedo carrying aircraft entitled "Method of and apparatus for delivering submarine torpedoes from airships." He suggested that aircraft would attack at night. Winston Churchill, as First Lord of the Admiralty from October 1911 to May 1915, was a strong proponent of naval air power. He established the Royal Naval Air Service in April 1912 and took flying lessons to foster aviation development. Churchill ordered the RNAS to design reconnaissance spotters and torpedo bombers for the Fleet.
First torpedo bombers
The British Admiralty ordered the Short Admiralty Type 81 biplane floatplane as a reconnaissance aircraft. It first flew in July 1913 and was loaded aboard the cruiser HMS Hermes, which had been converted to become the Royal Navy's first seaplane tender. When the rival Sopwith Special, designed from the outset as a torpedo bomber, failed to lift its payload off the water, Shorts converted the Type 81 to carry torpedoes in July 1914, just before the outbreak of the First World War.
On 28 July 1914, Arthur Longmore dropped the first aerial torpedo, a 14-inch 810 lb torpedo, from a Type 81 at the Royal Naval Air Station Calshot. The support wires of the floats were moved to allow the torpedo to be carried above the water and a specially designed quick-release mechanism was used.
The first plane designed from the outset as a torpedo bomber was the five-seat floatplane biplane AD Seaplane Type 1000 or AD1. However, it proved to be a failure. When the prototype built by J. Samuel White from the Isle of Wight first flew in June 1916, it was found to be too heavy and its float struts too weak for operations. Remaining orders were cancelled.
First World War
On 12 August 1915, a Royal Naval Air Service Short 184 floatplane torpedo bomber sank a Turkish merchantman in the Sea of Marmara. It was operating from HMS Ben-my-Chree, a seaplane carrier converted from a ferry. Fitted with an aircraft hangar, Ben-my-Chree was used to carry up to six biplanes with their wings folded back to reduce carrying space.
This was the first ship sunk by air-launched torpedo. Five days later, another ship supplying Turkish forces in the Gallipoli campaign against British, Australian and New Zealand troops was also sunk.
Production of the Short 184 continued until after the Armistice of 11 November 1918, with a total of 936 built by several manufacturers. It served in eight navies, including the Imperial Japanese Navy, which built them under licence.
The first torpedo bomber designed for operation from aircraft carriers was the Sopwith Cuckoo. First flown in June 1917, it was designed to take off from the Royal Navy's new aircraft carriers, but had to land on an airfield as arrester wires, needed to stop an aircraft during landing on a ship, had not yet been perfected. The Admiralty planned to use five carriers and 100-120 Cuckoos to attack the German High Seas Fleet, which had been sheltering in Kiel since the Battle of Jutland in 1916. When the war ended, only 90 Cuckoos had been completed, however.
The Vickers Vimy twin-engine heavy bomber was designed to bomb German cities in retribution for German air attacks on England. It reached squadrons in France too late to play a role in the First World War. Had the war continued, it would have been deployed as a torpedo bomber.
Of the major maritime nations, only Britain, Japan and the United States developed carrier-borne torpedo bombers after hostilities ceased in Europe. Initially, Japan purchased both ships and aircraft from Britain, as the Imperial Japanese Navy modelled itself on the Royal Navy. Of the three, only Britain and Japan also perceived a need for land-based torpedo bombers, though a number would be developed by other countries. Bordered by oceans against any possible foe, the United States ignored landplane torpedo bomber development.
The first landplane specifically designed as a torpedo bomber was the Hawker Horsley. By the mid 1930s, the torpedo bombers that would start the Second World War were being deployed. The Fairey Swordfish flew first in 1934, the Douglas TBD Devastator and Mitsubishi G3M (Nell) in 1935 and the Nakajima B5N (Kate) and Bristol Beaufort a year after that.
Second World War
In the early hours of 13 June 1940, two Beauforts found the German cruiser Lützow off Norway. The first was mistaken for a Junkers Ju 88 and was able to torpedo the Lützow without return fire, putting her out of action for six months. The second was shot down by defending Messerschmitt Bf 109s. Eight days later, nine Beauforts attacked the German battlecruiser Scharnhorst off Norway. As aerial torpedoes were unavailable, they dropped 500 lb (230 kg) bombs. No hits were scored, and defending Messerschmitt Bf 109s downed five.
Even before the outbreak of the Second World War, the Royal Navy had studied the threat in the Mediterranean posed by the Italian fleet, which had its advance base in the new port of Taranto in the "heel" of Italy. Captain Lumley Lyster of the aircraft carrier HMS Glorious proposed that his Fairey Swordfish torpedo bombers could launch a night attack against Taranto. At that time, the Royal Navy was the only force in the world with this capability. The Swordfish, a three-seat biplane, looked outmoded, but its low stall speed made it an ideal platform for launching torpedoes into the shallow waters of Taranto. The torpedoes were adapted with wire cables attached to their nose and wooden fins at their tail to slow their fall and make a shallow impact with the water, which was only 39 ft (12 m) deep.
On the night of 11 November 1940, 21 Swordfish left the new aircraft carrier HMS Illustrious. Some carried bombs and flares, but the main force carried torpedoes. British decoy maneuvers and the Italians' lack of radar allowed the British to surprise the ill-prepared Italian fleet at anchor in Taranto. Three battleships were put out of action, half of the Italian fleet, for the loss of two Swordfish. Two airmen were killed and two others captured. The next day, the remaining Italian battleships withdrew to Naples, ceding control of the Mediterranean to the British.
On 6 April 1941, a single Bristol Beaufort piloted by Flying Officer Kenneth Campbell attacked the German battleship Gneisenau in Brest harbour in Brittany, where she and her sister ship, Scharnhorst, were sheltering beneath a massive array of anti-aircraft guns. The other five Beauforts on the mission failed to rendezvous due to bad weather. Campbell received a posthumous Victoria Cross for launching his solo torpedo attack, which put Gneisenau out of action for six months.
On 26 May 1941, three Fairey Swordfish were launched from the Royal Navy's carrier HMS Ark Royal. They found the German battleship Bismarck in the eastern Atlantic battling a fierce gale. With the battleship's bow pitching up and down 60 ft (18 m) in 80 mph (130 km/h) winds, the Swordfish had to release their torpedoes into the troughs of waves to ensure they would run properly. Two torpedoes hit, the one fired by John Moffat striking the rudder and jamming it so severely that the huge ship could only turn helplessly in wide circles. Later that day, battleships and destroyers of the Royal Navy cornered her, and Bismarck's crew scuttled her after sustaining severe damage from heavy gun fire and more torpedoes.
In the attack on Pearl Harbor, Admiral Isoroku Yamamoto's fleet of six carriers launched 40 Nakajima B5N2 Kate torpedo bombers on Sunday, 7 December 1941. The Japanese struck the United States Pacific Fleet when it was moored in harbor. The torpedo bombers coordinated their attacks with dive bombers; the combined effort sank or damaged all eight of the battleships which they found moored in Pearl Harbor. The Japanese had studied the attack on Taranto and had practiced dropping specially modified Type 91 torpedoes in the shallow waters of Japan's Inland Sea. The Type 91 torpedo was considerably more capable than any others in the world at that time, being very fast and reliable, as well as allowing a much higher launch speed from a much greater altitude than other types. Only five Kates were lost in the attack. In later months, torpedo bombers were responsible for the sinking of the American aircraft carriers Lexington, Yorktown and Hornet.
Three days later, Admiral Sir Tom Phillips was returning to Singapore on board the new battleship HMS Prince of Wales after an unsuccessful attempt to impede Japanese landings in Malaya. His fleet included the First World War battlecruiser HMS Repulse and should also have had the new aircraft carrier HMS Indomitable with a squadron of Sea Hurricanes. But the carrier was delayed for repairs after running aground in the harbour at Kingston, Jamaica.
Eight Mitsubishi G3M Nell twin-engine level bombers and 17 Nell torpedo bombers found the two capital ships without air cover in broad daylight. They scored just a single bomb hit on Repulse and a single torpedo hit on Prince of Wales. The torpedo struck where the outer port propeller shaft exited the hull and Prince of Wales took on 2,400 st (34,000 lb; 15,000 kg) of water through a ruptured stern gland. The battleship listed 12 degrees to port preventing the starboard side 5.25 inch anti-aircraft guns from depressing low enough to deter more torpedo bombers.
A second squadron, this time of Mitsubishi G4M Betty torpedo bombers, now attacked both ships. Repulse had dodged 19 torpedoes by skillful steering, but now G4Ms attacked the bow from both sides and scored another hit. At about this point, Repulse radioed for defensive fighters. A squadron of 10 Royal Australian Air Force Brewster Buffalos arrived an hour later to watch Prince of Wales sink. Repulse had already sunk. Each ship had been hit by four torpedoes out of 49 fired. The Japanese lost four aircraft. Neither G3Ms nor G4Ms carried defensive armament, which had been stripped to extend their range. The presence of modern Allied fighters to defend the two capital ships might have led to a different outcome.
On 12 February 1942, Bristol Beauforts were dispatched to intercept the German cruiser Prinz Eugen off Trondheim, Norway. Prinz Eugen had accompanied Bismarck into the Atlantic, but returned to Brest. For the first time, the Beauforts were accompanied by Bristol Beaufighters and Bristol Blenheims. In a new RAF tactic, the Blenheims acted as decoys, making pretense torpedo runs, while the Beaufighters, a development of the Beaufort fitted with four 20mm cannons, shot up the anti-aircraft gunners. This was intended to give the Beauforts a clear torpedo run. However, none of the 28 Beauforts achieved a hit, and three aircraft were lost.
The United States Navy's standard torpedo bomber in 1942 was the Douglas TBD Devastator, first flown in 1935 and embarked on carriers of the Pacific Fleet in 1937. On 7 May 1942, Devastators sank the Japanese aircraft carrier Shōhō in the Battle of the Coral Sea, but failed to sink the aircraft carrier Shōkaku the next day.
At the Battle of Midway on 4 June 1942, 41 Devastators launched from three American carriers failed to score a single torpedo hit, and only six aircraft returned. The rest fell to defending Mitsubishi A6M Zeros and anti-aircraft fire. The attacks had been poorly coordinated, but the Devastator was immediately withdrawn from front-line service.
The successor to the Devastator, the Grumman TBF Avenger, arrived too late at Pearl Harbor to be loaded onto carriers for the Battle of Midway. However, six were flown from Midway Island. They fared no better, with five lost without a single hit.
Avengers became more successful as tactics improved and crews became more skilled. On 24 August 1942, 24 Avengers sank the light carrier Ryūjō at the Battle of the Eastern Solomons. At Guadalcanal, Avengers from the Navy and Marine Corps finished off the battleship Hiei, which had been damaged the night before.
Beauforts also had more success when they moved to Malta to attack Italian warships and transport. Flying Officer Arthur Aldridge discovered a convoy guarded by the heavy cruiser Trento early on 14 June 1942 some 200 miles (320 km) east of Malta. As in the attack on Lützow, the Beaufort was mistaken for a Junkers Ju 88, and Aldridge hit Trento with his torpedo; the ship was eventually finished off by the submarine HMS Umbra (P35), which was close by.
Action continued in the Pacific, where the last notable torpedo bomber attack took place on 7 April 1945. Avengers from Yorktown were searching between Okinawa and Honshu for the Japanese battleship Yamato, which was escorted by cruisers and destroyers. Her mission was to run aground on Okinawa to provide floating heavy artillery for the defending troops in the expected Allied seaborne invasion. Her 18.1 inch guns could have created havoc among frail landing craft. Yamato and her sister the Musashi were the largest, most powerful battleships in the world. Planned in great secrecy, they had been designed to take on three American battleships each and win.
The squadron led by Lieutenant Tom Stetson found the cruiser, which was the prime target, already sinking, so six planes were detached to attack the Yamato instead. One in which Frederick E. Wicklund was the tail gunner and radar/radio operator became detached from the formation whilst climbing in heavy cloud cover. The pilot, Lieutenant Grady Jean, asked each crewman in turn if they wished to make a solo attack, which was likely to prove suicidal. The crew referred the decision to the skipper, who deftly dodged anti-aircraft fire and 18-inch shell splashes from the Yamato's big guns to release their torpedo. Wicklund had recalled from a briefing that the Yamato had torpedo blisters to a depth of 22 ft (6.7 m), so he crawled back in the fuselage to reset the torpedo's running depth from the 10 ft (3.0 m) preset for the cruiser to 23 ft (7.0 m). He later explained that he heard no command to do this and doubted whether the other five planes had done so. In their case, their torpedoes would have exploded harmlessly against the blisters. A crewman photographed the explosion, in which debris rose to their altitude of 300 feet (91 m). Possibly a torpedo had hit the fuel storage. The Yamato rolled over and sank, with the loss of 90 percent of the crew. The Yorktown lost ten planes and twelve aircrew. All pilots involved in the attack were awarded the Navy Medal and every crewman the Distinguished Flying Cross.
During the war, Japanese torpedo bombers (mainly the Nakajima B5N) caused the sinking of the carriers USS Yorktown, USS Lexington, and USS Hornet, along with a number of other vessels (in addition to those lost during the attack on Pearl Harbor).
Obsolescence and replacement
Torpedoes travel under water at around 40 knots (74 km/h; 46 mph), a speed easily matched by 1930s destroyers. Fast battleships could make 32 knots (59 km/h; 37 mph). So it was possible for a skillful captain to evade torpedoes. HMS Repulse dodged 19 before Japanese torpedo bombers attacked simultaneously from both forward quarters. A rocket travelling at 1,000 mph (1,600 km/h) is another matter. The first air-launched rockets were fired by the French flying Nieuport 11s equipped with Le Prieur rockets to shoot down German observation balloons over the Western Front in 1916. Poor results resulted in other weapons becoming favoured and, except in the Soviet air force, the idea was largely forgotten until early 1941, when the Desert Air Force found its aircraft to be impotent against the panzers of Erwin Rommel's Afrika Korps. The British Army had used rockets against low-flying bombers during the Battle of Britain, and by enlarging the tube from 2 in (51 mm) to 3 inches (76 mm) and fitting first a 28 lb (13 kg) and then a 60 lb (27 kg) high-explosive warhead, a new weapon was quickly fitted to Hurricanes in June 1942 in time to deploy them against Rommel's tanks.
On 23 May 1943, a Fairey Swordfish destroyed U-boat U-752 in the Atlantic. Five days later, a Lockheed Hudson of RAF Coastal Command destroyed another in the Mediterranean. These rockets were fitted with iron spikes and fired at a shallow angle into the sea, puncturing the hull and making it impossible for a submarine to submerge. A new era in aircraft attacks on ships had been initiated. Caltech developed the 5 in (130 mm) High Velocity Aircraft Rocket, better known as "Holy Moses", with a 24 lb (11 kg) warhead for the US Navy. It was rushed to Europe for use on D-Day and later used by Navy planes in the Pacific.
Developments in rocketry and guided weapons have led to the modern anti-ship missile, which has rendered the torpedo nearly redundant in the surface attack role against well-defended targets, although torpedo attacks can still be expected.
During the Second World War, aircraft capabilities increased to such an extent that dedicated torpedo bombers were no longer a necessity, with the role being combined with others, usually attack or dive bomber roles, even combining those of torpedo bomber and fighter, as in the case of the Blackburn Firebrand. The single-engine Martin AM Mauler was capable of carrying three torpedoes, along with a variety of other ordnance. The United States Navy dropped its dive bomber and torpedo bomber designations, replacing them with a single attack designation, and the Royal Navy replaced its designations for similar types with a single strike designator.
Torpedoes continue in use by and against submarines, and both anti-submarine aircraft and maritime patrol aircraft are still equipped with them.
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One crucial limitation of a torpedo bomber was that it had to fly a long, straight course at a constant altitude of 30 m (98 ft) toward the target ship before launching its torpedo. Torpedoes were very complicated weapons and were prone to damage when landing on water, especially on a wave; they were ideally aimed at the bottom of a wave, but this was difficult to achieve in practice.
During a torpedo run, the attacking aircraft were easy targets for defending combat air patrol fighters. Furthermore, torpedo planes were also highly vulnerable to anti-aircraft fire, particularly the heavy anti-aircraft guns (such as the 5 inch DP) which fired into the water, creating water spouts to slap the torpedo planes.
In the 1930s, the Imperial Japanese Navy developed the best way for torpedo bombers to achieve a hit. They used an "anvil attack", in which two groups of torpedo planes approached the target ship's bow at an angle of about 45 degrees,[clarification needed] one on each side of the ship. The torpedoes were to be launched at the same distance from the ship; this would have ensured a hit no matter where the ship tried to maneuver. In practice, this kind of attack was difficult to coordinate and therefore extremely rare. Usually, combat air patrols and anti-aircraft fire quickly broke up approaching plane formations, forcing each aircraft to attack on its own. At Pearl Harbor, the ships were lined up and basically stationary, so the first attack wave of 40 torpedo bombers armed with Type 91 torpedoes, out of 183 planes, were able to hit the ships broadside, as the defenders were caught by surprise.
Torpedo bombers were best used as part of a coordinated attack with other types of aircraft. For instance, during the attack on the battleship Yamato, fighter planes strafed the ship with machine guns to suppress its anti-aircraft gun fire, while dive bombers tried to cause havoc and inflict topside damage, thus leaving the torpedo bombers unmolested in their attack runs.
However, if the attackers failed to achieve air superiority or surprise, torpedo bombers suffered heavy losses, regardless of whether the type was obsolete or not. This is best exemplified at the Battle of Midway, where Air Group Eight's dive bombers missed the Japanese carriers. Torpedo Squadron 8 (VT-8, from Hornet), led by Lieutenant Commander John C. Waldron, sighted the enemy carriers and attacked without any coordination with dive bombers or fighter cover. Without fighter escort, every TBD Devastator of VT-8 was shot down without inflicting any damage, with Ensign George H. Gay, Jr. being the only survivor. VT-8 was followed by Torpedo Squadron 6 (VT-6, from Enterprise). VT-6 met nearly the same fate, with no hits to show for its effort. The Japanese combat air patrol, flying the much faster Mitsubishi A6M2 "Zeros", made short work of the unescorted, slow, under-armed TBDs torpedo bombers. A few TBDs managed get within a few ship-lengths range of their targets before dropping their torpedoes.
At the Battle of the Santa Cruz Islands, the Nakajima B5N Kate despite being in service since 1935, played a key role in sinking USS Hornet, while the new Grumman TBF Avenger torpedo bombers failed to hit a fleet carrier.
When the targets were ships able to maneuver at high speed and hence much harder to hit, torpedoes proved less effective, except in cases when the crews launching them were especially well trained. Still, even a single torpedo hit on an enemy warship could cripple it decisively, especially in the case of vessels without an armored belt (cruisers and aircraft carriers often had torpedo blisters, but these were not as extensive as those of battleships). Even on heavily armored battleships, there was nothing to protect the rudder and propellers at the stern, as was demonstrated in the cases of the Bismarck and Prince of Wales and Repulse, and few had their protective belt extend to the extremities, and a hole made in the bow could be forced wider from the pressure of the water which could buckle and crush unarmored internal bulkheads, which worked against Yamato.
Notable torpedo bomber pilots
- Charles T. Beaird
- Kenneth Campbell
- Charles Edmonds
- Eugene Esmonde
- George H. W. Bush
- Mitsuo Fuchida
- George H. Gay, Jr.
- John C. Waldron
- John Kelvin Koelsch
- Ulvert M. Moore
- John Moffat
- Carlo Emanuele Buscaglia
- List of torpedo bombers
- Torpedo Bombers (Torpedonostsy), a 1983 Soviet film directed by Semyon Aranovich
- Chant, Chris. The world`s great bombers. Barnes and Noble, New York. 1990. ISBN 978-0-7607-2012-7
- US patent 1032394.
- Roskill. Steven Wentworth: Documents relating to the Royal Naval Air Service 1908-18, Navy Records Society, London, 1969.
- Barnes C.H. Shorts aircraft 1914-18: Putnam, London 1957.
- Jackson 1993, p.20
- Goodall, Mike. "Wight Elephants: Murray Sueter's Quest for a Large Military Aircraft". Air Enthusiast, No. 73, January/February 1998. Stamford, Lincs, UK:Key Publishing. ISSN 0143-5450
- Bruce J.M. The Short 184 Profile Publications, Leatherhead, England, 2001.
- Layman R.D. Naval aviation in the First World War: Its impact and influence. Caxton. London 2002. ISBN 1-84067-314-1
- David, Donald (ed.), The complete encyclopaedia of world aircraft. Noble and Barnes, New York 1977. ISBN 0-7607-0592-5
- Robertson, Bruce: Beaufort Special, Ian Allan, Shepperton, England 1976
- Stephen Martin: Grove, Eric Ed 1988. Sea Battles of World War Two in close-up. Ian Allan Shepperton. England. ISBN 0-7110-1596-1
- Churchill, The Grand Alliance, p. 268
- Daily Mail London, 10 May 2009.
- Peattie. Mark R. Sunburst: the rise of Japanese naval air power 1909-41: Naval Institute Press 1991: ISBN 1-59114-664-X
- Stephen, Martin: Sea battles in close-up Shepperton, England. Ian Allan 1988
- Doll. Thomas E. The Douglas TBD Devastator. Profile Publications, Leatherhead, England, 1967.
- Buell, Thomas B. The quiet warrior a biography of Admiral Raymond A. Spruance Annapolis MD: Naval Institute Press 1987. ISBN 978-0-87021-562-9
- Prange Gordon William et al : Miracle at Midway: Viking New York 1983: ISBN 0-14-006814-7
- Schom, Alan: The Eagle and the Rising Sun: The Japanese-American War 1941–43. Norton and Co., 2004. ISBN 0-393-32628-4.
- "The Real Story of the Yamato Sinking". March 6, 2008 edition of Grosse Pointe News, Grosse Pointe, Detroit, Michigan
- Pawke, Gerald: The Wheezers and Dodgers, Seaforth Publishing, London, 2009. ISBN 978-1-84832-026-0.
- Parsch, Andreas. US Air launched 5 inch rockets 2006.
- Mrazek, Robert, "A Dawn Like Thunder", testimony from surviving pilots
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