From the article:
As an Army officer, Maj. Stephen D. Carey has served tours of duty in Iraq and Afghanistan. In his spare time, he fights a different kind of battle, one that rages in the apocalyptic 41st millennium. The distant future would be a terrifying realm for a mere mortal, what with all the Necrons, Tyranids, and Tau on the loose. To survive the war-torn galaxy, Carey enlists the help of marauding, green-skinned Orks. He also presides over an Imperial Guard army, because some days, defending mankind is more fun than trying to destroy it.