AfghanistanVeteransRefugeesLagomorphaVeterans HealthHospitals, VeteransPakistanSmegmaAfghan Campaign 2001-Contraceptive AgentsIranVeterans Disability ClaimsIraq War, 2003-2011Persian Gulf SyndromeGulf WarVietnam ConflictCombat DisordersUnited StatesWarMilitary PersonnelStress Disorders, Post-TraumaticCross-Sectional StudiesIraqGenotypeDefoliants, ChemicalChemical Warfare2,4,5-Trichlorophenoxyacetic Acid