Subscribe to PGi, there are always articles in there about Tactics and Technique...
However targets for running and gunning are always good, so are small scenario games, by that i dont mean suddnely jump in a wood and pretend to be a soldier...
Take different moments of a game, say a final 3 on 2. Have 2 back men crossing up and commumicating loads, and have the three other guys try and eliminate them.
In theory the 3 should win simply as they have more numbers, but often the 2 guys win, as if they do what they are suppost to, laying down solid lanes and covering the other guys side they often create the first elimination.
Chance this around so you could do snake drills, keeping your snake guy covered, or like in dynasty disected trying a drill where you have to get to a certain bunker or spot first.
Also a very good drill for reloading i have learnt, is to go out on the field with half filled pods and half a hopper. If everyone does this then they are refilling twice as much as they would, therefore you have to get better otherwise you get stuck!!