The Forever War
"The Forever War" contains several parallels to "Starship Troopers", including its setting and the powered armor that Heinlein's novel first popularized. Commentators have described it as a reaction to Heinlein's novel, a suggestion Haldeman denies; the two novels are very different in terms of their attitude towards the military. "The Forever War" does not depict war as a noble pursuit, with the sides clearly defined as good and evil; instead, the novel explores the dehumanizing effect of war, influenced by the real world context of the Vietnam War.