The Post-Deployment Health Strategic Healthcare Group (PDHSHG) Registry System of Records is the information system encompassing the Ionizing Radiation Registry (IRR), the Agent Orange Registry (AOR), and the Gulf War Registry (GWR) which also includes related Depleted Uranium (DU) exams. The IRR area of the Environmental Health Program (EHP) database contains the results of questionnaires completed by Veterans who may have been exposed to ionizing radiation while on active military duty and have had an IRR examination at a VA medical facility.