In the story "Soldier's Home," why will Krebs not talk about the battles to the people at home?

Hemingway centers many of his stories novels around his personal experiences, especially those from WWI where he was wounded an ambulance driver.  He is one of the authors named "The Lost Generation." He could not cope with post-war America, and therefore he introduced a new type of character who struggles with, among other things, his surrounding post-war environment. In “Soldier’s Home,” Krebs' town does not understand the nature of war and continues to be preoccupied by things that no longer have meaning for him, because he does understand war--so thoroughly that he cannot speak about it for war is by nature “unspeakable.” This causes him to develop an attitude of “nada,” meaning “nothing.” For Hemingway, this attitude is an authentic reaction to the horror of war, and a true man recognizes this.  He also knows that to be a man he must be honest; he must not lie. Recognizing “That was all a lie,” Krebs tries to extricate himself from everything to at least be honest.  At the end, however, he succumbs to his mother, who makes him pray, and in praying, lie.  As a result, he fails as a “Hemingway hero.”  Weakening to the pressures of a woman, he loses his manhood, which he was holding onto only tenuously throughout the story. To the extent he does not lie, does not talk about the war, he maintains his integrity and manhood.