In the title - I would've read it sometime in the mid to late 90s, I suppose. Cover just had a weird-looking humanoid alien figure, front profile (head/chest) - wish I could be more detailed.
Anyway - the two stories I remember. The first one, dead humans are able to be resurrected and fight in wars, although they are just a bit clumsier/stupider than they were when they were alive? The protagonist looks down on them, until he finds out partway through that he actually is one himself. The zombie soldiers derisively refer to human soldiers as "realo trulos", I remember that much.
The second one, all I can remember is that it involved flashbacks to the Vietnam War, and at the end, the main character tears his own heart out with his bare hands.