afghanwar(2001-) anthropology belonging brotherhood camaraderie combat community empathy group-dynamics groupidentity history homecoming human-connection human-nature iraqwar(2003-) isolation junger largetypebooks loyalty mental-health military militaryhistory post-traumatic-stress-disorder post-traumatic-stress-disorder-(ptsd) post-war psychologicalaspects psychology ptsd reintegration resilience sacrifice sebastian sense-of-purpose social-bonds socialgroups socialsciences societal-disconnection society survival trauma tribal-instinct tribe tribe:-on-homecoming-and-belonging tribes unity veterans violenceinsociety war