FJAG
Army.ca Legend
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Yup, you are off on terminology. To simplify things ignore the term regiment. A Brigade group has roughly 5,000 folks and consists of a headquarters, three infantry battalions, a reconnaissance battalion, an artillery battalion, an engineer battalion and a service battalion of around 600 each. We have three such full-time RegF brigade groups albeit they are understrength.So to follow the 3 key questions being asked here...
1. Short of a major war declaration (WW2 level) the largest short notice deployment I can see is being a combat brigade (I don't think I have terminology correct here) based upon two regiments and associated support detachments. This would be paired most likely with a local brigade to flesh out the numbers needed. A good precedent is the Canadian Army units sent in WW1 which deployed as part of the British Army until such numbers were recruited, mobilized, "trained", and formed into the eventual Canadian Divisions and then years into the conflict the Canadian Corp.
If you take an infantry battalion and add a reconnaissance squadron (company-sized), an engineer squadron and an artillery battery you end up with what we call a battle group. In Afghanistan we essentially deployed a single battle groups in rotation after rotation under a single brigade headquarters.
Neither WW1 nor WW2 are good examples because at the start of each of those we had very few full-time soldiers but a fairly large number of part-time ones who needed training. These days we have three brigades that are capable of much more rapid deployment.
We currently have a battlegroup headquarters plus a rifle company and an artillery battery and other elements on Latvia. The battle group is fully staffed and equipped by companies from Spain, Italy and Poland as well as several smaller nations. The battle group operates within a multi national NATO structure.2. If we are assuming that in the case of large scale conflict we would be in a multinational brigade situation I would hope the defending nation (Latvia? Singapore? Jordan?) would be filling in the gaps. This is more like the Canadian Army in WW2 with the addition of British and Polish troops under the Canadian Army. However the capacity that force brings to the brigade is the difference in leadership...if it's just troops and rifles you have much less say than a LAV mobile unit complete with Air Defence, Artillery Support and Field Hospitals. It is the basis of providing the 2/3rd complete (and 100% complete backup often not mentioned logistics and support forces) that allows the Canadian Force to form the Skelton of an international brigade vs. a Korea like situations where we are just a force of many contributing to the Commonwealth Division. (Full disclosure I don't know as much about Korea so definitely not trying to downplay Canadian efforts there...it's just my initial impression).
Realistically I think Canada has the ability to deploy one more brigade group and sustain it for a few years or, alternatively, surge a larger force for a shorter term. That is hard to do under the current structure but possible within the number of RegF and ARes positions currently authorized by the Canadian government.
Personally, from a personal point of view we should form a multinational division headquarters with several Canadian brigades and some allied ones in order to make the political statement within NATO that a country of our wealth should be capable of making.
Plug and play doesn't work that well at this level. Augmentation by individual soldiers and small teams like a section only works when there is sufficient time to train as a formed element which IMHO is at a minimum the company of roughly 130 people. For Afghanistan we generally took four to six months of predeployment training to get an augmented unit up to snuff for any given roto. If companies have trained together they can be slotted into a battalion more easily.3. This is where I think, under the current manning and taskings there may be a better direction provided. We have a collection of units that range from section to company to regimental size but try to treat as equals regardless of mission and resourcing provided. Instead I view it as a collection of administrative units that provide formed section/platoon (Reserves) that fit into a pre-determined Company contained within a parent Reg. Force Unit. The advantage of Echo Company remaining "unmanned" is that should emergency deployment be required then Bravo Company of Reg Force X can be assigned the mission, as a formed sub unit, until additional mobilization can fill needs. This is more similar to the later Yugoslavia missions where reserve units were providing a much higher percentage of forces (Roto specific) than Reg Force as I understand and in a much more formed structure than what happened with Afghanistan.
As you say, if a two company battalion needs a third company in a hurry then this has to come from some other battalion to fill in. But even here, it still takes time to train-up for a mission.
Bosnia was a more permissive environment than Afghanistan and more risks could be taken. The problem with our ARes structure for some time now is that there are no real formed units that have trained together significantly in anything above platoon level at best. This is why we need to change.
That's the nature of domestic operations. The unit still operates as a unit under centralized leadership but can be widely dispersed on taskings.The other aspect of ensuring as high of caliber smaller unit leadership is looking at what's happening now on the East Coast. 300, now 700 members are deployed to assist in clean up. But any time I've heard of the military showing up it's common to have them split into subunits (company/platoon/section) for taskings with only CO and others remaining at a central point to coordinate with civilian authorities. It's not normally 800 troops of a regiment working on the same street or even neighborhood although it has happened in the past.