As per the Training Plan dated 16 May 03, the prerequisites for Rappel Master (AGMJ) are:
1. Cpl PLQ qualified;
2. Completed Rappel training (i.e. you must have completed military rappels previously);
3. Current medical; and
4. Current PT test.
There are no differences in the prerequisites for Reg Force or PRes.
Just a Sig Op, having a leadership course (CLC, JLC, whatever) has always been a prerequisite for the Rappel Master course, therefore your friend slipped through the cracks somehow. IMO he/she should not be dispatching troops because, besides from questioning the validity of his/her qualification, there are also liability issues.