sentences:  Like the novel, the series is based heavily on Haldeman's experiences in, and thoughts about, the Vietnam War, which are mirrored in the conduct of the military actions and propaganda operations of Earth's military government, especially in its treatment of enemies and the casualties / veterans on its own side.Like its protagonists, the series shows more resignation than outright cynicism at what are depicted as very human failings unchanged throughout history.Haldemann has noted that Marvano managed to include much more of the novel's "first-person ruminations" by Mandella in the graphic novel than the author had originally thought practical.