Tactics eh? Well Joe, I mostly use them for 2 things:
Artillery cover in like areas.
Assault cover and support.
The first condition is because we never know when some traffic-control-yahoo lieutenant is watching from the woods wanting to make a name for himself.
Second condition is that pesky +3 modifier when approaching an assault hex.
The caveat for me have been you need good over-watch. I've been scrabbed a couple times from AT fire. That leaves a serious mark.