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1-89 Custodian 2-89 Custodian 2-95 Custodian
1-02 Custodian 2-02 Custodian  

The Custodian course was for (mainly) operators to become conversant in the administration of the Communications Security accounting required to keep control of all the keying material and equipment used by the RAAF.  Some techs but more engineers did this course.