Yes. Operation Flashpoint was made by Bohemia Interactive and published by Codemasters, with BI owning the code but Codemasters owning the trademark. When the companies went their separate ways (iirc there was some drama, but can't remember about what), BI had to rename the next installment of the game series.
Operation Flashpoint having also been spun off into “VBS” (Virtual Battlespace Systems) a military combat simulator whose first client/user was incedentally the USMC. So AA’s was probably arguably the first mainstream (from the heavy promotion and the fact it was free, something out of the ordinary for an “AAA Game” at the time) “realistic shooter”, but certainly not the first.
