My suggestion is to add smoke grenades. Both military and homemade. Like the m18 or the l83a1 at military depos and police station. But for the homemade ones you'll need saltpeter, sugar, a frying pan, a can, some string, a frying pan, heat source and a cooling storage. First you'll have to mix the sugar and potassium nitrate, then heat the mix up and cool it down. Then just set it on fire and your done. Got no idea what use smoke grenades would but why not ;D