How is Krebs an example of an antihero in "Soldier's Home"?

Krebs is an antihero because he does not have the traditional heroic qualities such as self-sacrifice, charisma, and purpose. He is selfish, listless, reserved, and lacking direction in life. He is a member of the "Lost Generation"--the generation that was haunted by World War I. Krebs seems lost in his own thoughts, and spends his days looking at pretty girls, going to the pool hall, and reading about the battles he was in. He is not sure of his role in the war, and he is not sure about his role in his family. He does not fit in.  Yes, he did demonstrate sacrifice by serving in the army, but after he comes home he seems selfish, and he says that he doesn't love anyone, not even his mother. Krebs is not the good-looking, all-American hero that gets the girls; he is disillusioned about life and uncertain of his future.