Iron Storm it is.
Not exactly a good FPS; even on the easiest difficulty it spends most of the game being fairly difficult before raising the bar to downright impossible at each mini-boss. You're running along with regular bullet-based guns and a handful of grenades and no idea that you're coming up to a boss, and then suddenly in some narrow corridor there he is -- a guy who takes several sniper rifle headshots to kill. And he's carrying a rocket launcher which will kill you from blast damage in one shot.
The first time you're still carrying one yourself from a helicopter encounter, so after much trying you can lob a grenade around the corner just right to flush him out and then take him down with a shot from that. By the second time your rockets have been taken off you[1], so you get to exploit engine bugs to shoot through the wall corner at him while he can't see you. The third time... I dunno, I gave up around then.
It was reworked for the PS2 as World War Zero, and then re-reworked for a PC rerelease with the same name. In the process they removed multiplayer, quicksaves between checkpoints and support for 1280x1024.
[1] The weapon removal was the crappiest game mechanic I've seen in a long time. The story goes that you're sneaking into a POW camp so you can blend in and hitch a ride back to the enemy head city, and so you have to throw away your heavy weapons (generally a sniper rifle and rocket launcher at that point) to blend in. You can, however, somehow keep your knife, machine pistol, shotgun and 40 grenades of various types without looking the tiniest bit out of place...
