What makes kerbs decide to leave home in a soldiers home?

In "Soldier's Home" by Ernest Hemingway, Krebs decides to leave home because he struggles to readjust to civilian life after returning from World War I. He feels disconnected from his family and community, and longs for the simplicity and camaraderie of military life. Krebs also experiences difficulty in connecting with those around him, leading him to feel alienated and isolated.