ok new here need some advice

[krtkllr70]

Been playing for 4 days now and even if the controls are ODD ! I have come to the conclusiom that I DIG THIS GAME ,it is way cool'
enough realisim ( et difficulty as well) and action to make older gamers like me piss off the little lady once again .This thing rocks but,, how come i cant play any other missions or armys but the Soviets?? do i have to complete this campain before playing as Americans or Germans>???
ANY ADVICE PLEASE.
THIS BUGGER IS REALLY A LOT OF FUN PLEASE CLUE ME BECAUSE IM REALLY LIKEING THIS THING .
( SORRY FOR THE CAPS) .