Here‘s a little bit of repetition from RCA:
QLs are the MOC trg crses for NCMs (both Reg and Res_
QL2=Recruit Trg
QL3=your basic MOC trg ie become a gunner, infanteer, tanker etc )
QL4=adv trades trg ie Dvivers, Machine gunners, Motorman, Arty Techs etc.
QL5 are Reg F crse
QL6A=qual you for Sgts ie Section Comd, Detachment Comd, Crew Comd
QL6B qual you for WO ie Plt WO, TSM etc
QL7 qual for MWO
for officers it is either phase trg (Reg and Res) or MITCP (Res only and tend to be short duration summer crses) where you progress from almost recruit trg up through various levels of trg similar to QL crseto qual you for each rank/posn next above you.
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That should probably sum up for you the various options open to you throughout your career.
-the patriot-