I appreciate the offer, but since we're playing two hours every 2-3 weeks, I'm not sure how feasible it is to do drills and the like. It's not what I want out of the sessions, at least. Yes, it's fun to improve at cooperating, but at the moment I think it's more realistic to do so while doing missions rather than using the time to train.
What's been working well is that one of the people playing has a lot of Arma experience, and when he takes the lead it makes a huge difference. Other than that, though, I'd rather point people in the direction of dslyecxi's video guides and hope that they check them out and take them to heart.