Rogue Trooper: The Future of War — Gerry Finley-Day

The war between the Norts and the Southers chemically poisoned the entire atmosphere of NuEarth, so the Southers created the Genetic Infantrymen: blueskinned soldiers who could breathe the toxic air, equipped with biochips to record their personalities in their final moments, for eventual recorporation. But a Souther traitor sold the G.I.s out, and all but one were slaughtered. Now this survivor stalks NuEarth on a mission of revenge, aided by his dead friends now living in his gun, helmet and backpack. He is the last G.I. the Rogue Trooper!