2010 american armedforces casestudies civicaction disasterrelief earthquakerelief emergencymanagement evaluation general haiti haitiearthquake his027000pol012000pol035000 history humanitarianassistance interagencycoordination international internationalrelations internationalsecurity mercenarytroops military militaryartandscience militarypolicy non-governmentalorganizations politicalaspects politicalfreedom politicalscience privatemilitarycompanies rulesandpractice security securitysector state the unitedstates