The Regiment
From Air-Force.ca Wiki
In many nations' armies a regiment is a fighting formation. This is untrue in Canada and most Commonwealth nations.
In Canada and the UK, a regiment is more like a military family. It may consist of one unit or it may include several units.
Typically, Canadian regiments only consist of one unit, however there are several examples of infantry regiments wich consist of multible units called battalions. The R22eR includes three regular force battalions (numbered 1 to 3) and two reserve force battalions (numbered 4 and 6).