*Defending; the turrets should be in use at all times. Always I repeat always keep a close eye for damage on the turret.
Use the rockets on attacking vehicles as well as snipers. They are on a timer so they will re-generate.
After the v1.30 update on the beta the turret can be destroyed easier.
Make your squad members aware of damage before you lose the turret. You will be killed if it blows up with you in it.
*Attacking; be aware of the turret!!
The SVER turrets will get you the most. The bunkers are close together and very deadly.
Get a sniper or a upgraded machine gun to take these out. You will see your crosshairs turning red when damage is being done.
After the update v1.30 you will recieve 15 XP points for destroying a bunker.
Good Luck!