The present protocol represents Phase III of the study--clinical examinations of a sample of 1,000 Gulf War (GW) veterans and their spouses and children and 1,000 Gulf War era nondeployed veterans and their spouses and children. Results from Phase I indicated that the prevalence of several self-reported health conditions are elevated in the GW veterans compared to the control group. The overall purpose of the Phase III study is to corroborate these findings through more objective clinical examination.