yes, but you have to unlock new weapons and gadgets buy using that type of class and getting kills or 'flag captures' or 'M-con defuses' or 'plants'. The classes are: Assault, Engineer, Medic and...
Battlefield 2 is one of the best FPS games ever made.
BF2 was released in 2004(?) by EA and was developed by DICE. It places you into a modern day battlefield to fight it out amongst three armies...
there is no port of battlefield 2 to the playstation 2, but there is a separate game called battlefield 2: modern combat available for it, which people still play online. hope this helps!