AIR 78 Abbreviation

Discussion in 'The War In The Air' started by peterhastie, Aug 5, 2020.

  1. peterhastie

    peterhastie Senior Member

    Does anyone know what the initials "BT" mean at the bottom of an AIR 78 card?

    I know "F" is F reserve.
  2. RAFCommands

    RAFCommands Senior Member

    These two alpha group codes are usually on post war cards.

    I was told they were cyclic redundancy checks (CRC) for the transcription of service numbers when they files were punch card/computer indexed. Operated like checksums in data packets for transmission today.

    Last edited: Aug 5, 2020
  3. peterhastie

    peterhastie Senior Member

    He was, 1546992, T.D. Barron M.I.D. June 1944, if that helps, or changes anything?
  4. RAFCommands

    RAFCommands Senior Member

    The index cards were an updated record as actions were done on the registry

    BT was added later in a similar way to the WAAF maiden name cards that were annotated with the married surname.
  5. peterhastie

    peterhastie Senior Member

    Ok, thanks for that.

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