Are there real people behind the faces of OFP's cast of soldiers?

Sure there are! Just take a look at this picture here, at this one of General Ivan Vasilii Guba and at this BIS OFP team page. Similarly, OFP's Angelina is none other than BIS' very own Kamila Clarová. This was initially revealed in a Codemasters July 2001 press release and in this Adrenalin Vault article.