Ah, I am a little fuzzy on a rule or two.
We have limits on the amount of snipers etc per team, right?
But, can we change classes as we play? Or do we have to stick with the class we have chosen?

Its not limits on snipers, its just limits on classes in general.

At any one time there can be no more than

2 snipers per team
4 light infantry per team
4 assault infantry per team
2 heavy weapons infantry per team

But yes, you can change class whenever and as often as you like.

You wont have to worry about making sure you have the right numbers of each class, it will be set server side so that those numbers will be automatically enforced. ie, if you already have 4 light infantry on your team, and you try to change to light infantry, the server will just not let you.

Thanks for teh info.
And I knew that it wasn't just snipers, thus the 'etc' in my post :)