5: The Forever War, by Joe Haldeman.
This is another novel which, if a live action flick is ever announced, will undoubtedly shoot up at number one. It is classic space opera and science fiction, with gripping action and strong, memorable characters. An amazing mix of tech-explorative fiction and war fiction, with just the right touch of possibility, lurking between the lines and staring at you with drug-augmented ferociousness, told by the dark humored soldier whose life spans the thousand years and more of the bloody conflict which gives its name to the series.
Extremely hard to put down.
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