Whether or not Officers can/could/should be employed in training roles such as SATT, DI etc. I think drives into a wider issue within the Corps.
There is so much “role-creep” in the Corps now, it is difficult to clearly differentiate - I think - in some cases, what are (or should be) the roles and responsibilities of the various personnel of varying status.
E.g. as a CI, it is now the case that the only thing you can’t do (AFAIK!)is be in command of a unit. I haven’t seen the recent statistics on this, but I would imagine that the majority of CFAVs in the ATC are CIs.
If you can be an AT instructor, SAAI, Training Officer, Adj, etc. etc. where is the incentive to aspire to uniformed service? (other than having an aspiration to command).
Also, if you can now command a unit as an SNCO/WO - although granted that the majority of Sqn Cdrs are still Officers - where is the incentive to aspire to commissioned service?
If an Officer can/could become qualified as a SAAI, DI, or AT instructor, is time spent on those duties not time that - in their role - they should be spending on being (or being trained to become) the Training Officer, Adj, or OC?
It seems to me that other Cadet Forces have clearer lines of demarcation between the roles and responsibilities of different personnel, and thus have clearer progression routes, and better structured and organised training to meet the requirements and demands of service in the relevant status/rank/role.
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What do we require Officers to be able to do (when trained)?
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What do we require SNCOs to be able to do (when trained)?
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What do we require WOs to be able to do (when trained)?
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What should be the role(s)/responsibilities of a CI?
If we can answer these key questions (as a Corps), and identify clearly differentiated roles and responsibilities for personnel of each status, then training can be designed to meet the relevant requirements.
At the moment - in my view - the Corps is putting the cart in front of the horse. Clearly defined roles and responsibilities could lead to well structured training, well designed to meet the relevant role requirements.
On a personal hobby-horse, I also think we should introduce ACF style Civilian Assistants (CAs), to clearly demark between the current situation where some CIs instruct cadets, and some CIs are basically “helpers” doing admin, running the canteen, maintaining the SOV, etc. CIs would require MOI training, CAs would not (but could not be involved in training/instruction of cadets).
Rant off 
Cheers
BTI