the assault with a smoke grenade is great for those rush maps where your team is having problems getting in to the objected because the other team has the area guarded very well. get some smoke cover going and then go in but watch out for the enemy blindly
tossing some hand grenades in, once the objective is armed then toss your hand grenades in to help keep them from disarming.
speaking of smoke, do you like the run your tank with smoke? harvest day, oasis and heavy metal a tank with smoke keeps those pesky tracer darts off your tank.