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Imperial Japanese Navy Kokutai
IJN Kokutai were redesignated numerically on November 1, 1942

1st Ku
2nd Ku (582 Ku)
3rd Ku (202 Ku)
5th Ku (452 Ku)
Chitose (4th, 201 Ku)
6th Ku (204 Ku)
Tainan (251 Ku)
Genzan (252 Ku)
253 Ku

31st Ku (954 Ku)
33rd Ku (932 Ku)

522nd Ku

634 Ku
Mihoro (701 Ku)
4th Kokutai (702 Ku)
703 Ku
Misawa (705 Ku)
Kanoya (751 Ku)
Takao (753 Ku)
755 Ku
761 Ku

801 Ku
802 Ku
851 Ku
938 Ku
951 Ku
954 Ku (31st Ku)
958 Ku
1022 Ku

GF = Remgo Kantai
F = Kantai
SF = Koku Sentai
FG = Kokutai

Yokosuka Kokutai
Tail code ヨ-XXX. The backward 'ヨ' translates to "YO" for "Yokosuka".
Operated from Yokosuka Airfield during 1945 with A6M7 Model 62 Zeros for defense of the home islands

1st Kokutai

2nd Kokutai (582 Kokutai)

3rd Kokutai (202 Kokutai)

Established
Aircraft
Areas of Operation
February 1, 1942 C5N2
A6M2
Taiwan
Java
Rabaul

Redesignated 202 Kokutai on November 1, 1942.
Disbanded July 10, 1944

Tail Code X-000 during: April 10, 1941 - November 1, 1942 became 202 Ku.)

Chitose Kokutai (4th Kokutai, 201 Kokutai)

5th Kokutai (452 Kokutai)

6th Kokutai (204 Kokutai)

Established
Aircraft
Areas of Operation
??? A6M2
Rabaul

Tail code U-1XX (three digit).

On November 1, 1942 redesignated the 204 Kokutai, 26 Koku Sentai. Operated from Rabaul and later Yap.

Tail codes:
T2-XXX - used during middle 1943
9-XXX has been said to belong to the 204 Ku

 

14th Kokutai

During 1937, operated at the beginning of the China incident (Shina-Jihen) flying A5M Claudes

Tail Codes:
2-XXX
9-XXX
6-XXX

31st Kokutai

 

33rd Kokutai (932 Kokutai)

Established
Aircraft
Areas of Operation
February 1, 1942 D3A Val
Balikpapan (February 1942)
Makassar (March 1942)
Surabaya (April - June 1942)
Batavia (Jakarta) July - October 1942


Formed 1 February 1942 at Saeki; assigned to 3rd Fleet with eight Type 99 bombers, 8 Type 97 attackers; April 1942, moved under Southwest District Fleet, 2nd Southern Fleet, 21 Naval Base Force; 1 August 1942, got rid of Type 99 bombers (to 31st Kokutai) and became attacker unit only, using Type 97 only; redesignated 932nd Kokutai November 1, 1942. Thanks to Jim Long for this information.

201 Kokutai

Established
Aircraft
Areas of Operation
  A6M Zero
Rabaul

W1 was unit code from Nov 1942 to at least July 1943

One of the tail fins in the Blayd collection has tail code 6-136 over an earlier code of W1-187.

6-XXX may have been used by 201 Ku during mid to late summer of 1943.

 

202 Kokutai

Established
Aircraft
Areas of Operation
  A6M Zero
Yap
Rabaul

Operated the Zero fighter from Yap Island.

Tainan Kokutai (251 Kokutai)

Genzan Kokutai (252 Kokutai)

253 Kokutai

301 Kokutai

Established
Aircraft
Areas of Operation
  Zero

Iwo Jima (June - July 1944)

 

321 Kokutai

Established
Aircraft
Areas of Operation
   

 

 

552 Kokutai

Equipped with 25 D3A2 Val. First went to Rabaul November 14 - 17, 1943 , then withdrew to Truk on December 5, 1943. It was there for R&R no more than ten days when news of the Allied landing at Arawe caused the unit to be ordered back to Rabaul on the 15th. It reached Rabaul by December 18th with some 20+ Vals and was based at Keravat up through January 25, 1944. The unit withdrew again to Truk on January 26, 1944 (Last time Vals operated out of Rabaul) and operated there until the end of February.

634 Kokutai

Operated E16 Paul in the Philippines. Based at Canacao Seaplane Base (Cavite) with the T-301 Hikotai. Also, a detachment at Tacloban Seaplane Base.

Mihoro Kokutai (701 Kokutai)

Established
Aircraft
Areas of Operation
  G4M2 Nell
G4M1 Betty
Tinian
Vunakanau
Japan
Clark Field (Oct 1944)

On November 1, 1942 redesignated the 701 Kokutai, 26 Koku Sentai (26th Air Flotilla).

During December 2, 1942 until March 12, 1943 operated from Vunakanau Airfield near Rabaul.

Disbanded on March 15, 1943 due to attrition. The survivors returned to Japan where they converted to the G4M1 Betty and flew anti-submarine patrols.

During October 1944 operated from Clark Field.

702 Kokutai

703 Kokutai

Misawa Kokutai (705 Kokutai)

Kisarazu Kokutai (707 Kokutai)

Formed at Kisarazu Airfield.

Operated G4M1 Betty bombers from Vunakanau Airfield near Rabaul. Flew four bombing missions over Guadalcanal during September 1942.

On November 1, 1942 redesignated the 707 Kokutai.

Tail Codes
The group used different tail codes at various dates.

Tail code Dates
R- November 1, 1942 - ?
W1- ?

Kanoya Kokutai (751 Kokutai)

Takao Kokutai (753 Kokutai)

Established
Aircraft
Areas of Operation
  G4M Betty
Koepang

Operated the G4M1 Betty. Tail code "T-XXX" (three numbers). During November 1942 arrived at Koepang Airfield. On November 1, 1942 redesignated 753 Kokutai.

761 Kokutai

Established
Aircraft
Areas of Operation
  G4M Betty
Clark Field

801 Kokutai

Established
Aircraft
Areas of Operation
  Mavis  

Departed South Pacific area after October 1942

802 Kokutai

Established
Aircraft
Areas of Operation
  A6M2-N
Emily
Shortland until March 1943
Marshalls

Tail code N1- until the middle of 1943
Tail code Y4 - used in Marshalls

Toko Kokutai (851 Kokutai)

Established
Aircraft
Areas of Operation
  Mavis
Indian Ocea

Formed at Toko, Taiwan on October 1, 1940.

Operated the H6K5 Mavis, strength in December 1941 was 24 x H6K2 Mavis.

Tail code: O-?? (ie O-16)

As part of the Midway Expeditionary Force, they operated 21st Koku Sentai, Toko Kokutai 2 x Type 2 H8K1 "Emily" Flying Boats. Detachement of six operate from Kiska

On November 1, 1942 redesignated 851 Kokutai. On November 11, 1942 to Shortland Seaplane Base.

Transfered to Indian Ocean Area in February 1943

901 Kokutai

Transfered to Indian Ocean Area in February 1943.

In January 1945, based at Toko, Taiwan and Hong Kong. Supplied Jakes to the 936th Kokutai.

933 Kokutai

As of January 1, 1945, 933rd Kokutai in Indochina was absorbed by 936th Kokutai.

936 Kokutai

As of January 1, 1945, 933rd Kokutai and other Jake Kokutai in Indochina were absorbed by the 936th Kokutai. Supplied Jakes from the 901st Kokutai then based at Toko, Taiwan and Hong Kong. Some of these aircraft were immediately pressed into service and not repainted, thus still had their 901st Ku markings.

938 Kokutai

951 Kokutai
Activated on 15 December 1944 to streamline enhanced sea-lane protection measures by having Sasebo Ku, Maizuru Ku, Okainawa Ku, 453 Ku, and 256 Ku merged. With the headquarters based at Sasebo the unit had detachments to Chinkai, Kunsan, Saisuto, Hakata, Ohmura, Ibusuki, Koroku, Shanghai, Ryojun, Chintao, Fuko, and Shuzanto covering the South of Japan Sea, East China Sea as well as Genkai straits. Surveillance, ASW, and convoy escort. On 1 July 1945 the unit was reduced to a Suitei-tai only. 951st had 24 N1K1 Rex aircraft on 15 December 1944, but by 1 July 1945 these N1K1s had been removed from the unit and it was left with only 24 3-seat reconnaissance seaplanes (E13 Jake). References: magazine article by Akimoto, 1982.

954 Kokutai

958 Kokutai

1022 Kokutai

Established
Aircraft
Areas of Operation
  G4M
Luzon, Cebu

Tail code 1022-XX or 22-XX

Formed on July 10, 1944. Used G4M1 Betty bombers as armed transports. Operated from the Philippines from Clark Field, Lingayen and Cebu.

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