I am Canadian.
Are there any "JTF-2" Units? An M16A2 would be passable as a C7
Yes and No. Airsofts are... replicas, down to trademarks and markings on recievers. You could bitch out a -16A2 to do Automatic, and I'm sure a JTF-2 operator thing wouldn't be hard to make a mockup of either. I'd actually start with an M-16A3, since those are easier to modify, and I wouldn't have to saw off the carrying handle to attach an ELCAN or a proper Canadian-style ironsight.
If any of you are more familiar with paintball, the same general scenarios can be carried out in Airsoft, but as far as I know, MilSim is exclusive to Airsoft.
ROEs apply outside of Norther Ireland, obviously. Generally the ROE is defined for a particular mission, and for combat operations are loose, but peacekeepers have to put up with a lot of sh*t (Like 82mm mortar rounds slamming around their OP) before they can return fire, if at all.
In the US, I imagine most Airsoft units would structure themselves according to MilSim, but the beauty of that is the ability to quickly break things down to do DeathMatches, Team Deathmatches, and the like. For the record, a DM or TDM is really a "free for all." The successful team in that case, is he who thinks.