Killzone (USA) ISO

Killzone is a first-person shooter exlusive to the PlayStation 2, developed by  Guerrilla Games. 
The game is set in an era of space colonization where the Helghast (the game's main enemies) have recovered from their defeat in the First Extrasolar War and launched a massive attack against the outer Interplanetary Strategic Alliance (ISA) colony planet Vekta. Vekta's orbital Strategic Defense (S.D.) platforms failed during the initial assault, allowing the Helghast to land swarms of soldiers onto the surface and making it all the more difficult for the outnumbered ISA forces.
The game was released in 2004.