There is lots of training you might end up doing in your career that is open to any MOSID. What is likely is another story.
I was curious however and did a query on what are the "active" qualifications targeted at the Armoured Crewman. There is some pretty neat training available without going outside the MOSID. It kind of makes me want to be back in the combat arms!
Before I post the list, the disclaimer is that I am not in the RCAC and have no real experience with them. This is the list that I received (with some edits for clarity) when the query was placed "what are the active national qualifications that are targeted at the MOC 011 NCM but not core qualifications levels. So... some of these might still be on the books for one reason or another but impossible to get. Or might be so specific you need to be in a limited job to get them... with that in mind I found the list quite interesting... some of it does not make sense to me, but I will attribute this to my ignorance of the happenings in the RCAC.
I hope this of some interest / generates some conversation.
MC
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AIUW - Leopard C2 Gunner - be QL3 qualified
AJST - Leopard 2 Gunner - be qualified DP1 Armour Reconnaissance Crewman (AIWI) and be qualified DP1 Armour Reconnaissance Troop Leader (ACZU)
AFCK - Leopard C2 Main Battle Tank (MBT) Driver - Crewman QL3 (AIWI) qualified with initial vehicle qualification on Land Force Command Driver Wheel (AJUV and one or more of the following AIPL, AJUN or AIPN)
AJRE - Leopard 2A6M Main Battle Tank (MBT) Driver - be CRMN QL3 (AIWI) qualified with initial qualification on Land Force Command Driver Wheel (AJUV and one or more of the following AIPL, AJUN or AIPN)
AJHI - Leopard C2 Crew Commander Gunnery - NCM, be qualified DP3 Armour Reconnaissance Crew Commander (AIWJ)
AFCE - Tank Commander - For NCM, be qualified DP3 Armour Reconnaissance Crew Commander (AIWJ) and Leopard C-2 Basic Gunner
AJLE - Tank Troop Commander - be AFCE qualified, be AJHI qualified and for NCMs, be DP3 Recce Troop Warrant (AIWL) qualified
AIKS - Coyote Driver - be QL3 qualified and be AGJN qualified
AIKT - Coyote Surveillance Operator - be DP1/QL3 qualified
AIPQ - One Meter Turret Operator - NCMs, be DP1 qualified
AJCA - 25mm Turret Operator - for NCMs, be QL3 qualified
AKMG -LAV Crew Gunnery Trainer (CGT) System Operator - NCMs DP2 qualified and qualified 25mm Turret Operator Course (AJCA)
AJSG - Light Armoured Vehicle (LAV) Remote Weapon System (RWS) NANUK Operator - For NCM, be DP1 Qualified, TOET's C6/C9
AIPR - AN/MWG-055 Remote Weapon System Operator - for NCM's DP1 Qualified
AJHH - RG31 Armour Patrol Vehicle Driver - be qualified Commercial/General Air Brake training, TOETs on C6 and 50 cal HMG, completed the LFC Dvr Wh course on a minimum of one B veh
AIUD - Armoured Vehicle Administrative Movement - be qualified DP1 / QL3
AJFS - Heavy Machine Gun - Gunner - be QL3 qualified
AGLZ - Mountain Operations Advanced - NCMs, be the rank of Cpl or above and be qualified PLQ, Mod 2
AJRN - Tactical Exploitation Team Member - No prereqs specified.
AJHS - Multi-Agent Tactical Sentry Operator - Be SS AIUS qualified and be Driver ATV qualified
AIVO - Urban Operations Instructor (UOI) - for NCMs, be the rank of MCpl to WO and have minimum Demolitions Basic code AJBV
AJQC - Army Direct Fire Specialist Minimum rank of MCpl or Officer DP1, Qualified Crew Commander ARCC (Armd - AIWJ) minimum one year experience, Must have instructed on at least 1 Gunnery Course - NCMs only and Qualified LAV Crew Gunnery Trainer Operator
AJGR - LAV TUA Crew Commander - be qualified LAV TUA Gunner (AHDN) and qualified DP3 Armour Reconnaissance Crew Commander (AIWJ), or DP1 Armour Reconnaissance Troop Leader (ACZU)
ADHN - LAV TUA Gunner - be DP1 qualified or above
AGJY - Advanced Driver Combat Arms - minimum rank of Sgt and hold a current DND driver's permit for unit wheeled and tracked vehicles
AGNK - Drill - All Arms - be QL6A qualified (with a minimum of 2 years in rank)
AGPJ - Helicopter Observer - be QL6A qualified or above
AHNY - Army Technical Warrant Officer - be the rank of WO or above and be Advanced leadership Qualification (ALQ) qualified