[Pyros]

Hi,

Special Forces have better mobility, visibility etc..., thus you may use these units as shock units.

Anyway, the infiltration routine that Chris mentioned, isn't a good aspect of the game (this is why almost all PBEM players state as a rule no infiltrators) because it isn't realistic to suddenly see a unit next to yours deep inside the rear of your lines. The SF operations are not connected with an active battlezone because in such an environment everyone is alerted and infiltration is almost impossible.
The infiltration of the Special Forces is based on the surprise element or the night-factor (visibility 1-2).

cheers,
Pyros