Hospitals, VeteransUnited States Department of Veterans AffairsVeteransUnited StatesVeterans HealthRetrospective StudiesCohort StudiesAfrican AmericansEuropean Continental Ancestry GroupTime FactorsTreatment OutcomeMultivariate AnalysisRisk FactorsVeterans Disability ClaimsAdministration, OralAfghan Campaign 2001-Iraq War, 2003-2011Persian Gulf SyndromeGulf WarVietnam ConflictCombat DisordersWarMilitary PersonnelStress Disorders, Post-TraumaticIraqDrug Administration ScheduleInjections, IntravenousUnited States Food and Drug AdministrationDefoliants, ChemicalDose-Response Relationship, DrugDrug Administration RoutesRats, Sprague-DawleyChemical Warfare