The Killzone series isn’t exactly the most popular Sony franchise in Japan, and that’s why the house of PlayStation picked up a mangaka and put him at work on a Killzone manga.
The one-shot comic, drawn by Kamome Mukojima (that also drawn Grave Digger) has been published on Monthly Shonen Ace on August the 26th, but the most interesting part is that Sony Computer Entertainment just made it available online for us to enjoy. You can read it all (assuming that you can read Japanese, otherwise you can watch the panels, I guess) here.
The story revolves around Huey and Ross, the only survivors of an ISA platoon that became mercenaries. Unfortunately I wouldn’t count on an English translation any time soon, unless some fan translator picks it up.