How did A6M5 Zero pilots actually speak over voice radio in combat (1944)? (2 Viewers)

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ViperZ

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Sep 23, 2026
I am trying to reconstruct historically accurate voice-radio (radio telephone) communications used by Imperial Japanese Navy A6M5 Zero pilots in 1944.

I am not primarily looking for information about the reliability or technical specifications of the Zero's radio. I am trying to find the actual Japanese words and phraseology used when voice radio (無線電話) was used in combat.

For example, what would an IJN fighter pilot actually say for:

  • "Enemy fighters, two o'clock"
  • "Enemy aircraft above / behind"
  • "Form up"
  • "Attack"
  • "Follow me"
  • "Cover me"
  • "Disengage"
  • "Return to base / carrier"

I am also trying to determine whether a formation leader would actually address a formation by its organizational designation, such as 第一小隊 (Dai-ichi Shōtai / 1st Shotai), over voice radio, or whether an assigned radio call sign would normally have been used.

One Japanese Army aviation example I have found is:

「二時、四マル、敵戦闘機二六」

which appears to convey direction → altitude → enemy type → number in a very compressed form.

However, I do not assume that IJAAF and IJNAF phraseology or procedures were identical. I am specifically looking for IJN evidence, preferably from 1943–45 fighter units.

I have also been examining 『海軍作戦通信史』 (Kaigun Sakusen Tsūshin-shi / History of Naval Operational Communications), which discusses special communication procedures for aircraft and refers to aviation-specific communication regulations. So far, however, I have not found examples of the actual spoken fighter calls.

Does anyone know of an IJN wartime manual, combat report, pilot diary/memoir, communication regulation, or other source that records the actual words spoken over voice radio by Zero or other IJN fighter pilots?

Japanese-language sources are completely fine. A scan, archival reference number, manual title, page reference, or even one documented example of an actual IJN fighter voice transmission would be extremely helpful.

Thank you.
 

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