Frank as Oberfeldwebel
|Born||19 August 1920
|Died||27 April 1944
near Eindhoven, Netherlands
|Buried at||Ysselsteyn, Netherlands
(Block Z—Row 6—Grave 149)
|Years of service||1939–44|
World War II
|Awards||Knight's Cross of the Iron Cross with Oak Leaves (posthumously)|
Rudolf Frank (19 August 1920 – 27 April 1944) was a German Luftwaffe military aviator during World War II, a night fighter ace credited with 45 enemy aircraft shot down in 183 combat missions. All of his victories were claimed over the Western Front in nocturnal Defense of the Reich missions against the Bomber Command of the Royal Air Force (RAF).
Born in Karlsruhe-Grünwinkel, Frank volunteered for military service in the Luftwaffe of the Third Reich in 1939 after finishing school. Following flight training, he was posted to Nachtjagdgeschwader 3 (NJG 3—3rd Night Fighter Wing) in 1941. He was awarded the Knight's Cross of the Iron Cross on 6 April 1944 following his 42nd aerial victory. Three weeks later, on 27 April 1944, he and his crew attacked an Avro Lancaster, which exploded and fatally damaged their own aircraft. Frank ordered his crew to bail out but was unable to save himself. He received posthumous promotion to Leutnant (second lieutenant) and was awarded the Knight's Cross of the Iron Cross with Oak Leaves.
Early life and career
Frank was born on 19 August 1920 in Karlsruhe-Grünwinkel in what was the Republic of Baden of the Weimar Republic; Grünwinkel is now a borough located in the southwest suburbs of Karlsruhe. Frank was the older of two sons of a shoemaker. He attended the Volksschule (elementary school) in Grünwinkel from 1926 to 1930, when he was enrolled in the Realgymnasium—a secondary school built on the mid-level Realschule—where he attained his Mittlere Reife (school leaving certificate) in 1939.
Even as a boy, Frank had wanted to become a pilot. World War II had begun on 1 September 1939 and he volunteered for military service in the Luftwaffe. Following his basic military training, he took flying instruction at the pilot school in Zeltweg. Here he qualified to fly the Bücker Bü 131, Bü 133 and Bü 181, the Klemm Kl 35, the Arado Ar 66, Ar 68 and Ar 96, the Focke-Wulf Fw 58, and the Junkers W 34 and Junkers Ju 52.[Note 1] In October 1940 he transferred to Nachtjagdschule 1 (1st Night Fighter School) at Schleißheim near Munich, formerly the Zerstörerschule 1 (ZS 1—1st Destroyer School). There he specialized as a night fighter pilot in the 2nd Squadron under the command of Staffelkapitän (squadron leader) Oberleutnant (First Lieutenant) Günther Specht.
World War II
Frank was posted to the 1. Ergänzungsstaffel (1st Supplemental Training Squadron) of Nachtjagdgeschwader 3 (NJG 3—3rd Night Fighter Wing) on 5 February 1941.[Note 2] The unit was stationed at Stuttgart-Echterdingen (now Stuttgart Airport). Initially he flew with radio operator (Bordfunker) Gefreiter (Private) Willimowski before Hans-Georg Schierholz was assigned as his permanent radio operator. Frank and Schierholz had already formed a crew at the Nachtjagdschule 1 at Schleißheim. The two were then assigned to 1. Staffel (1st Squadron) of NJG 3 stationed at Vechta. 1. Staffel was under the command of Staffelkapitän Oberleutnant Walter Milius. This unit was equipped with the C-variant of the Messerschmitt Bf 110 heavy fighter. Both Frank and Schierholz were promoted to the rank of Gefreiter on 1 March 1941.
Night fighter pilot
Frank and Schierholz flew Bf 110 C-4 "L1+GH" on their first operational combat mission on 9 May 1941, without success. They flew their second mission on 12 May and an additional nine missions before claiming their first aerial victory during the night of 3/4 July. The mission started at 22:45 from Oldenburg and intercepted a Royal Air Force (RAF) Vickers Wellington at 00:54, which crashed 10 kilometers (6.2 miles) north of Grafeld/Oldenburg. For this achievement, Frank and Schierholz were awarded the Iron Cross 2nd Class (Eisernes Kreuz 2. Klasse). On 15 July, they claimed their second victory, a Handley Page Halifax that they shot down at 01:05 northwest of Meppen. The victory was, however, credited to the anti-aircraft artillery.
By 13 August 1941, Frank had flown 20 night fighter missions. For this achievement, he was awarded the Front Flying Clasp of the Luftwaffe for Night Fighters in Bronze (Frontflugspange für Nachtjäger in Bronze) and was promoted to Unteroffizier (sergeant). He was credited with his second victory on 15 September 1941, a Wellington shot down at 23:30 northwest of Meppen. This was also his last claim in 1941. He achieved his third victory, a Handley Page Hampden he shot down at 21:03 on 21 January 1942 near Berge in northeast Lingen. Five days later he claimed an Armstrong Whitworth Whitley Mk V, shot down at 20:36 west of Quakenbrück.
Frank was awarded the Iron Cross 1st Class (Eisernes Kreuz 1. Klasse) on 15 April 1942 and two months later, on 18 June 1942, the Front Flying Clasp of the Luftwaffe for Night Fighters in Silver (Frontflugspange für Nachtjäger in Silber). On 30 June 1942 at 01:29, he and Schierholz took off from Vechta on their 64th combat mission. While attacking a British bomber, either a Wellington or Halifax, their aircraft was hit by the defensive fire from the tail gun position at 02:40. With both radiators destroyed, they bailed out from their aircraft.
Frank's Gruppe (group) relocated to Rheine in Westphalia on 28 July 1942, when he flew further missions with Dornier Do 217 J "D5+G5", a night fighter variant of the Do 217. He claimed a Wellington shot down at 02:05 on 14 September 1942; it crashed in the vicinity of Osnabrück, and was his only victory while flying a Do 217. On this mission, the Dornier suffered engine problems and Frank made a forced landing at Bad Zwischenahn, damaging the aircraft. He ended the year 1942 with seven confirmed victories to his credit.
The first victory Frank claimed in 1943 occurred on 3 March. Again flying a Bf 110, he shot down a Short Stirling south of Delmenhorst. Contact with three other enemy bombers did not lead to any victories. Frank flew further missions in Do 217 "D5+LK" on a target practice mission on 9 April 1943. The right landing gear collapsed during the landing, causing 10% damage to the aircraft. Three days later he made an error during the landing approach, crashing Do 217 "D5+IK" and causing 30% damage. Frank avoided an official reprimand for either crash.
On 1 April 1943, Frank and Schierholz were transferred to the 2. Staffel of NJG 3, which was located at Wittmundhafen. Here they underwent conversion training to the Junkers Ju 88 C-6, which was designed for long distance night fighter operations. While Frank was training, his old unit was relocated to Gilze-Rijen in the Netherlands. His unit also received the newer G-version of the Bf 110; these were equipped with SN-2 Lichtenstein radar. When Frank and Schierholz returned from conversion training, they were assigned Bf 110 G-4 "D5+CH" to fly as their personal aircraft. They claimed a Lancaster near Antwerp on 15 June 1943. Two days later, on 17 June, they intercepted and shot down three more Lancasters from a force returning from a mission against Cologne. The three Lancasters came down within 41 minutes of each other over the Scheldt Estuary.
Frank claimed his 13th victory, a Wellington, on 22 June. While attempting another attack, both radiators were shot out and the crew was again forced to bail out. On 4 July they shot down a Halifax bomber north of Antwerp; this was his 14th victory overall. The unit relocated to Juvincourt, France, on 16 July 1943. Frank was awarded the Honor Goblet of the Luftwaffe (Ehrenpokal der Luftwaffe) on 9 August 1943. Now flying Ju 88 C-6 "D5+EK", again from Wittmundhafen, he claimed three aircraft shot down on 24 August 1944, but only received credit for the Short Stirling shot down at 00:47 over Berlin. Following his 110th operational mission, he was awarded the Front Flying Clasp of the Luftwaffe for Night Fighters in Gold (Frontflugspange für Nachtjäger in Gold) on 18 August 1943.
Around this time in 1943, the two-man Bf 110 crew was augmented by a third member, sometimes referred to as Bordmechaniker (air mechanic) or Bordschütze (air gunner). On 31 August, Frank shot down two British bombers, a Halifax northwest of Venlo and a Lancaster east of Diepholz, during separate combat missions. On 2 September, his aircraft was hit in the right engine by enemy fire and he was forced to belly-land the Ju 88 "D5+DK" at Wilhelmshaven, suffering 20% damage to the aircraft. He claimed his 20th victory on the night of 23/24 September 1943. He added two more victories and on 17 October 1943 received the German Cross in Gold (Deutsches Kreuz in Gold). The next day his aircraft was hit by German anti-aircraft artillery and Frank was forced to make a landing at Vechta on one engine. He was posted to the 3. Staffel on 14 December and ended the year with 26 aerial victories to his credit. A British intruder night-fighter shot Frank and his crew down over Berlin in a Junkers Ju 88 C-6, "D5+HP", on 24 December 1943, but they all managed to bail out unharmed.
Knight's Cross of the Iron Cross
Frank claimed his first victories of 1944, a Lancaster and a Wellington, on 21 January 1944 near Magdeburg. Having been promoted to Feldwebel (staff sergeant), Frank was assigned to the Stab (headquarters unit) of NJG 3, under the command of Geschwaderkommodore (Wing Commander) Oberstleutnant (Lieutenant Colonel) Helmut Lent. Frank's previous 6. Staffel had been transferred to Nachtjagdgeschwader 1 (NJG 1—1st Night Fighter Wing), where it continued operations under the designation of 12. Staffel.
On 20 February 1944, between 01:53 to 05:04, Frank became an "ace in a day", shooting down five Lancaster bombers on their way to attack Leipzig. He was sent on a mission against intruding de Havilland Mosquito night-fighters on 7 March, but did not achieve any victories. He claimed his next victories on 22 March, a Lancaster shot down near Osnabrück and a Halifax near Gütersloh. On the same mission, while attacking a third bomber, his Messerschmitt Bf 110 "D5+BL" was damaged. An incendiary bomb, probably released by the bomber, penetrated the right wing and damaged the engine. Frank managed to bring the aircraft down at Gießen.
Three more bombers shot down on 25 March took Frank's total to 39 aerial victories. The Luftwaffe had its most successful night of the war on 30 March 1944. The entire night-fighter force was credited with the destruction of 132 enemy aircraft that night; Frank, who was credited with a further three bombers, brought his total to 42. For this achievement Oberfeldwebel (Senior Staff Sergeant) Frank was awarded the Knight's Cross of the Iron Cross (Ritterkreuz des Eisernen Kreuzes) on 6 April 1944. The presentation was made by Generalleutnant Joseph Schmid, commander of the I. Jagdkorps, at his headquarters in Braunschweig-Waggum on 10 April 1944. Frank then went on a short vacation at home with his wife Lisa, a Luftwaffenhelferin (female air force helper).
Following his vacation, Frank claimed two victories on 23 April 1944, a Halifax shot down at 02:11 north of Geldern and, later that day, a Short Stirling at 23:47 over Lolland. The Stirling was on a minelaying operation. The story and fate of No. 76 Squadron Halifax MZ578/MP-I is described by the former crew-member, Tom Wingham, in his book "Halifax Down!: On the Run from the Gestapo, 1944".
Death and posthumous honors
Frank was assigned Junkers Ju 88 (Werknummer 751 095—factory number) on 17 April 1944. He never flew this aircraft operationally. Ten days later, on the night of 26/27 April, he and his crew of radio operator Oberfeldwebel Schierholz and air mechanic Feldwebel Heinz Schneider took off in Messerschmitt Bf 110 G-4 "D5+CL" (Werknummer 720074) from Vechta. The mission was to intercept incoming bombers heading for the Ruhr Area.
The crew spotted and attacked an Avro Lancaster bomber over the vicinity of Eindhoven in the Netherlands. The bomber, severely hit by cannon fire at 01:58, exploded and became Frank's 45th and last aerial victory. Debris from the Lancaster tore off the Messerschmitt's right wing and Frank lost control of the aircraft. He gave the order to bail out. Schierholz and Schneider parachuted to safety but Frank failed to get out in time. He was killed when the Bf 110 crashed at Heeze, 9 kilometers (5.6 mi) southeast of Eindhoven.
Frank was buried at the German War Cemetery Ysselsteyn (Block Z—Row 6—Grave 149) at Venray. The funeral was attended by his parents, his crew Schierholz and Schneider, his Gruppenkommandeur Hauptmann Werner Husemann, the fighter operations leader for the Holland and Ruhr area Generalleutnant Walter Grabmann, and Generalmajor Ernst Exss, the airfield sector commander.
On 20 July 1944, Frank was posthumously awarded the Knight's Cross of the Iron Cross with Oak Leaves (Ritterkreuz des Eisernen Kreuzes mit Eichenlaub), the 531st soldier or officer of the Wehrmacht to receive this award. On 27 April Lent submitted a request to the I. Jagdkorps, recommending Frank for a promotion to Leutnant. The commander of the 2nd Fighter Division Generalmajor Max Ibel as well as Schmid were supportive of the request. Frank was posthumously promoted Leutnant, backdated to 1 April 1944.
Aerial victory credits
Ace of spades) indicates those aerial victories which made Frank an ace-in-a-day, a term which designates a fighter pilot who has shot down five or more airplanes in a single day. This and the ♠ (
|Chronicle of aerial victories|
|Victory||Date||Time||Type||Location||Unit||Serial No./Squadron No.|
|– Messerschmitt Bf 110 C-4 L1+GH –|
|1||4 July 1941||00:54||Vickers Wellington||10 km (6.2 mi) north of Grafeld/Oldenburg|
|—||15 July 1941||01:05||Handley Page Halifax||northwest of Meppen|
|– Messerschmitt Bf 110 D-3 L1+DH –|
|2||15 September 1941||23:30||Vickers Wellington||northwest of Meppen|
|– Messerschmitt Bf 110 E-2 D5+EH –|
|3||21 January 1942||21:03||Handley Page Hampden||near Berge (northeast Lingen)|
|– Messerschmitt Bf 110 E-2 D5+HH –|
|4||26 January 1942||20:36||Armstrong Whitworth Whitley||west of Quakenbrück|
|5||3 July 1942||01:45||Vickers Wellington||5 km (3.1 mi) north of Cloppenburg|
|6||3 July 1942||02:13||Vickers Wellington||20 km (12 mi) southwest of Vechta|
|– Dornier Do 217 J D5+GH –|
|7||14 September 1942||03:42||Vickers Wellington||10 km (6.2 mi) east of Lingen|
|– Messerschmitt Bf 110 C-2 D5+BH –|
|8||3 March 1943||22:22||Short Stirling||south of Delmenhorst|
|– Messerschmitt Bf 110 G-4 D5+CH –|
|9||15 June 1943||01:24||Avro Lancaster||Antwerp||No. 50 Squadron||ED810/VN-Z|
|10||17 June 1943||00:58||Avro Lancaster||Scheldt Estuary|
|11||17 June 1943||01:18||Avro Lancaster||Scheldt Estuary|
|12||17 June 1943||01:39||Avro Lancaster||Scheldt Estuary|
|13||22 June 1943||01:24||Vickers Wellington||20 km (12 mi) east of Antwerp|
|– Messerschmitt Bf 110 G-4 D5+BH –|
|14||4 July 1943||01:06||Handley Page Halifax||north of Antwerp|
|– Junkers Ju 88 C-6 D5+EK –|
|15||24 August 1943||00:47||Short Stirling||Berlin|
|16||31 August 1943||03:43||Handley Page Halifax||northwest of Venlo|
|17||31 August 1943||23:28||Avro Lancaster||east of Diepholz|
|– Junkers Ju 88 C-6 D5+DK –|
|18||6 September 1943||00:14||Four-engined bomber||Saargebiet|
|– Junkers Ju 88 C-6 D5+LK –|
|19||22 September 1943||23:35||Handley Page Halifax||Hanover|
|– Junkers Ju 88 C-6 D5+KK –|
|20||23 September 1943||23:42||Avro Lancaster||Mannheim|
|– Junkers Ju 88 C-6 D5+LK –|
|21||3 October 1943||21:56||Handley Page Halifax||northwest of Bad Zwischenahn|
|22||8 October 1943||00:16||Vickers Wellington||30 km (19 mi) north of Norderney|
|– Junkers Ju 88 C-6 D5+IK –|
|23||18 November 1943||23:12||Avro Lancaster||east of Lingen|
|– Junkers Ju 88 C-6 D5+AK –|
|24||26 November 1943||22:22||Avro Lancaster||west of Quakenbrück|
|– Junkers Ju 88 C-6 D5+IK –|
|25||26 November 1943||23:30||Avro Lancaster||east of Papenburg|
|26||16 December 1943||21:49||Avro Lancaster||east of Dümmer|
|– Junkers Ju 88 C-6 D5+IP –|
|27||21 January 1944||22:57||Avro Lancaster||Magdeburg|
|28||21 January 1944||23:19||Vickers Wellington||Magdeburg|
|– Messerschmitt Bf 110 G-4 D5+HL –|
|29||15 February 1944||19:58||Four-engined bomber||south of Wismar|
|30♠||20 February 1944||01:53||Avro Lancaster||northwest of Delmenhorst|
|31♠||20 February 1944||02:21||Avro Lancaster||south of Bremen|
|32♠||20 February 1944||02:48||Avro Lancaster||east of Celle|
|33♠||20 February 1944||04:33||Avro Lancaster||west of Vechta|
|34♠||20 February 1944||05:04||Avro Lancaster||north of Meppen|
|– Messerschmitt Bf 110 G-4 D5+BL –|
|35||22 March 1944||21:38||Avro Lancaster||north of Osnabrück|
|36||22 March 1944||21:54||Handley Page Halifax||west of Gütersloh|
|– Messerschmitt Bf 110 G-4 D5+CL –|
|37||25 March 1944||00:22||Avro Lancaster||northwest of Essen in Oldenburg|
|38||25 March 1944||00:39||Avro Lancaster||north of Quakenbrück|
|39||25 March 1944||01:04||Four-engined bomber||south of Papenburg|
|40||31 March 1944||00:01||Avro Lancaster||west of Vogelsberg|
|41||31 March 1944||00:18||Avro Lancaster||north of Fulda|
|42||31 March 1944||00:57||Handley Page Halifax||Rhön|
|– Messerschmitt Bf 110 G-4 D5+PL –|
|43||23 April 1944||02:11||Handley Page Halifax III||north of Geldern||No. 76 Squadron||MZ578/MP-I|
|– Messerschmitt Bf 110 G-4 D5+CL –|
|44||23 April 1944||23:30||Short Stirling III||Isle Lolland||No. 75 Squadron||EF137/AA-E|
|45||27 April 1944||01:58||Avro Lancaster III||east of Eindhoven||No. 12 Squadron||ND873/PH-H|
Awards and decorations
- Aviator badge
- Iron Cross (1939)
- Ehrenpokal der Luftwaffe on 9 August 1943 as Unteroffizier and pilot
- Front Flying Clasp of the Luftwaffe
- German Cross in Gold on 17 October 1943 as Unteroffizier in the 2./Nachtjagdgeschwader 3
- Knight's Cross of the Iron Cross with Oak Leaves
- Flight training in the Luftwaffe progressed through the levels A1, A2 and B1, B2, referred to as A/B flight training. A training included theoretical and practical training in aerobatics, navigation, long-distance flights and dead-stick landings. The B courses included high-altitude flights, instrument flights, night landings and training to handle the aircraft in difficult situations. For pilots destined to fly multi-engine aircraft, the training was completed with the Luftwaffe Advanced Pilot's Certificate (Erweiterter Luftwaffen-Flugzeugführerschein), also known as C-Certificate.
- For an explanation of Luftwaffe unit designations, see Organisation of the Luftwaffe during World War II.
- For a list of Luftwaffe night fighter aces see List of German World War II night fighter aces.
- Schumann 2014, p. 2.
- Schumann 2014, pp. 2–5.
- Schumann 2014, p. 6.
- Schumann 2014, p. 8.
- Schumann 2014, p. 9.
- Schumann 2014, p. 11.
- Schumann 2014, p. 13.
- Hinchliffe 1999, p. 56.
- Schumann 2014, p. 15.
- Schumann 2014, p. 16.
- Schumann 2014, pp. 16–17.
- Schumann 2014, p. 17.
- Schumann 2014, p. 18.
- Schumann 2014, p. 19.
- Schumann 2014, pp. 19, 21.
- Schumann 2014, pp. 21–22.
- Schumann 2014, p. 23.
- "22/23.04.1944 No, 76 Squadron Halifax III MZ578 MP-I Sq/Ldr. Stanley A. Somerscales DFC". Aircrew Remembered. Retrieved 11 October 2014.
- Schumann 2014, p. 32.
- Schumann 2014, p. 42.
- Schumann 2014, p. 40.
- Obermaier 1986, p. 68.
- Schumann 2014, p. 43.
- "Pilot details". Royal Air Force Commands. Retrieved 11 October 2014.
- Søren C. Flensted. "Stirling III EF137 crashed near Vemmenæs east of the island of Tåsinge 23/4-1944.". Airwar over Denmark. Retrieved 11 October 2014.
- Schumann 2014, p. ii.
- Patzwall 2008, p. 79.
- Patzwall & Scherzer 2001, p. 119.
- Scherzer 2007, p. 315.
- Fellgiebel 2000, p. 184.
- Von Seemen 1976, p. 130.
- Fellgiebel 2000, p. 85.
- Von Seemen 1976, p. 47.
- Fellgiebel, Walther-Peer (2000). Die Träger des Ritterkreuzes des Eisernen Kreuzes 1939–1945 – Die Inhaber der höchsten Auszeichnung des Zweiten Weltkrieges aller Wehrmachtsteile [The Bearers of the Knight's Cross of the Iron Cross 1939–1945 — The Owners of the Highest Award of the Second World War of all Wehrmacht Branches] (in German). Friedberg, Germany: Podzun-Pallas. ISBN 978-3-7909-0284-6.
- Hinchliffe, Peter (1999). Schnaufer: Ace of Diamonds. Brimscombe Port, UK: Tempus. ISBN 978-0-7524-1690-8.
- Obermaier, Ernst (1989). Die Ritterkreuzträger der Luftwaffe Jagdflieger 1939 – 1945 [The Knight's Cross Bearers of the Luftwaffe Fighter Force 1941 – 1945] (in German). Mainz, Germany: Verlag Dieter Hoffmann. ISBN 978-3-87341-065-7.
- Patzwall, Klaus D.; Scherzer, Veit (2001). Das Deutsche Kreuz 1941 – 1945 Geschichte und Inhaber Band II [The German Cross 1941 – 1945 History and Recipients Volume 2] (in German). Norderstedt, Germany: Verlag Klaus D. Patzwall. ISBN 978-3-931533-45-8.
- Patzwall, Klaus D. (2008). Der Ehrenpokal für besondere Leistung im Luftkrieg [The Honor Goblet for Outstanding Achievement in the Air War] (in German). Norderstedt, Germany: Verlag Klaus D. Patzwall. ISBN 978-3-931533-08-3.
- Scherzer, Veit (2007). Die Ritterkreuzträger 1939–1945 Die Inhaber des Ritterkreuzes des Eisernen Kreuzes 1939 von Heer, Luftwaffe, Kriegsmarine, Waffen-SS, Volkssturm sowie mit Deutschland verbündeter Streitkräfte nach den Unterlagen des Bundesarchives [The Knight's Cross Bearers 1939–1945 The Holders of the Knight's Cross of the Iron Cross 1939 by Army, Air Force, Navy, Waffen-SS, Volkssturm and Allied Forces with Germany According to the Documents of the Federal Archives] (in German). Jena, Germany: Scherzers Miltaer-Verlag. ISBN 978-3-938845-17-2.
- Schumann, Ralf (2014). Ritterkreuzträger Profile Nr. 13 Rudolf Frank — Eichenlaubträger der Nachtjagd [Knight's Cross Profiles Nr. 13 Rudolf Frank — Oak Leaves Bearer of the Night Fighter Force] (in German). UNITEC-Medienvertrieb. OCLC 883388135. ASIN B00JQ4TPDO (16 June 2014).
- Von Seemen, Gerhard (1976). Die Ritterkreuzträger 1939–1945 : die Ritterkreuzträger sämtlicher Wehrmachtteile, Brillanten-, Schwerter- und Eichenlaubträger in der Reihenfolge der Verleihung : Anhang mit Verleihungsbestimmungen und weiteren Angaben [The Knight's Cross Bearers 1939–1945 : The Knight's Cross Bearers of All the Armed Services, Diamonds, Swords and Oak Leaves Bearers in the Order of Presentation: Appendix with Further Information and Presentation Requirements] (in German). Friedberg, Germany: Podzun-Verlag. ISBN 978-3-7909-0051-4.
- "Rudolf Frank". World War 2 Awards.com. Retrieved 10 October 2014.
- "Rudolf Frank". Luftwaffe 39–45 (in Portuguese). Retrieved 19 October 2013.
- "Frank Rudolf". Weltkriegsopfer.de (in German). Retrieved 14 September 2013.