Basically, I recommend you talk to your MCpl/Sgt, whoever you "next up" is a superior, and tell them you are thinking of changing trades and why. They might try to tell you that you "can't OT, you don't have enough time in". And they are right...you'd be looking at a MOC Reassignment IAW CFAO 11-12.
Here is a link that has some detail, from the CFAO (CF Admin Order). https://army.ca/forums/threads/79625/post-754861.html#msg754861
Now, on top of that Order, there was also something that used to be in play called the Basic Training List Admin Guide...for MOC Reassignments, it states this:
Occupation Reassignment
214. Overview Occupation reassignment is roughly equivalent to occupation transfer (OT), except that it applies to personnel on the SUTL or BTL who are not yet occupation qualified in their current occupation. This includes personnel who were previously qualified in another occupation (eg OTs, CFRs, component transfers, etc). While the basic process is very similar to that for OT, there are some specific policies affecting reassignment which are quite different. D Mil C7 is currently the CF occupation reassignment authority for all untrained personnel [I would suspect this has changed...but its not really important who the OR authority is. Suffice to say, it isn't CFSCE or CFSATE], and executes this responsibility IAW FA direction. Reassignment, like OT, is an integral part of CF retention initiatives and seeks to balance the career choices and aspirations of individual CF personnel with the legitimate needs of the service. CMP (FA) guiding principles in carrying out the procedures outlined below are procedural fairness and consistency.
215. Reassignment Lists
D Mil C 7 releases a monthly message detailing the occupations (both NCM and officer) open for BTL voluntary and compulsory reassignment for that month. For SUTL officers (ie those ROTP, UTPNCM, MOTP and DOTP officers still attending academic studies), there is an annual program conducted each fall for voluntary reassignment. Occupation reassignment lists are developed by D Mil C 7 based on intake requirements and training vacancies for each occupation. For BTL officer and NCM reassignments, the occupations that are considered open (in) are limited to those that have a remaining intake requirement against the Internal SIP for the current fiscal year (FY). The voluntary reassignment lists are further limited to occupations that are seriously under strength (IAW DGPR occupation status list) or are in danger of not meeting minimum training loads. The SUTL reassignment list is based on the remaining production requirement for the projected production year. This is developed from the FY production requirement detailed in the DGPR Statement of Production Requirements with the Long Range Planning Model ratios for ROTP/UTPNCM applied and taking into account any personnel already in the training system. Seriously undermanned occupations may have limited opportunities for voluntary reassignment out of the occupation.
216. Eligibility – Voluntary Reassignment
Personnel on the BTL/SUTL may request voluntary reassignment as indicated
below:
a. BTL NCMs – after BMQ. May apply at any time after completion of BMQ and before completion of occupation training. May only request from voluntary list and may be limited out of under-strength occupations;
e. The trainee shall submit a written request through his chain of command clearly indicating the new MOSID(s) to which he/she is requesting VOR or, if the trainee has no new MOSID in mind and wishes to investigate what other MOSIDs for which he/she may be qualified. In the written request the trainee will clearly indicate what his/her career intentions (release or remain in current MOSID) should the trainee be deemed not suitable for VOR or the trainees decide that the MOSIDs offered are not personally acceptable. Personnel requesting a VOR will not normally be permitted to cease training. However, the Basic Training Manager, in consultation with the Training Establishment, may decide that the trainee will be removed from training if capacity issues and/or administrative or disciplinary problems prove that the trainee is a disruptive influence or otherwise unacceptable presence on the a course.
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Now, I can't comment on if the BTAGs are the latest and up to date version, etc, however the policy would be something close to that, if not exact.
My recommendation is
1. inform your CoC ASAP of your wishes and intentions.
2. be careful in your wording...you are not requesting an Occupation Transfer, you aren't trained yet. You are requesting an MOC Reassignment.
3. If you are sure you don't want to be "what trade you are now"...at the same time you can request they set up an appointment with the Personnel Selection Office to see a Personnel Selection Officer for assessment/consideration for Reassignment. The PSO office will have all the latest rules and regs and lists that you'll need.
4. be prepared to put it all in a memo to start a paper trail...your MCpl/Sgt should be able to help you with that. If they won't...that's a different issue.
5. expect some resistance and the odd Jedi Mind Trick (you don't want to switch trades...infantry isn't the trade you're looking for) from your CoC.
Need any other advice, come on back. Oh, and yes, as you aren't trained yet in your MOSID you are on the BTL (not holding a position in a unit yet).