Battlefield heroes choosing commando or soldier?

When i make a hero in battlefield heros i can choose the type commando,soldier and gunner... wats the difference do they have different abilities and weapons or wat?Battlefield heroes choosing commando or soldier?
The Commando is usually a "stalker", for lack of a better word. He mostly tends to use Snipers, knives, and has the special ability to turn invisible for a short amount of time. Soldier is just your regular, shooter genre, army man. He uses automatic machine guns with a pistol, these guys are usually good at close and medium range. A gunner, is a heavy machine gun wielding guy. He usually has a rocket launcher on the side, this guy is good at close and medium range, depending on who you are fighting.