The Forever War
The latest book I've taken out of my "read pending" queue is The Forever War, by Joe Haldeman. Its credits include the Nebula Award in 1975 and the Hugo Award in 1976, and being considered one of the classics of the genre.
This is a fairly short science-fiction novel (250 pages in my mass-market paperback copy), dealing with the main character William Mandela, a young physics student drafted into the UN-controlled space army when war breaks out against the Taurans, an alien species we at first know nothing about (I'll purposefully avoid getting into a detailed discussion of the plot).
The novel is told to us from Mandela's viewpoint; Mandela narrates everything that happens in a very easy to read colloquial style, with an exquisite attention to details; the short chapters the book is divided in makes it a breeze to read -- a weekend in my case (and I'm no fast reader).
The Mandela character is well constructed, and his account reads like a friend telling you the story of his life. There are other characters that barely appear in the novel, yet they also feel properly written. The plot is simple and direct, with just a couple of nasty turns at key points in the story (you'll know them when you see them).
This description may remind some people of Heinlein's Starship Troopers: young guy (Mandela/Rico) enters the army, goes through a training period, goes to war with an unknown species, kicks butt and all that. Actually, that superficial description is where the resemblance stops: the way Mandela and John Rico get into the army is distinct, the training period is quite different, the aliens have nothing in common; both novels focus mainly on different stuff, and the few common themes are treated differently. If you expect this to be a Starship Troopers clone, you'll be surprised.
Surprisingly, the treatment of science isn't -- very detailed. There is enough of it to dismiss claims of this being a war novel simply translated into a SF setting (even if the author's acknowledged that the novel deals with his experiences in the Vietnam war), but hard-SF zealots might be disappointed.
All in all, this was a very enjoyable read, and I highly recommend it. I've voted 9 for this novel in the Top100SF.
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(Spoiler: the unexpected source is BSD)