b'Service exam and may have served overseas, and Civil Service Officers who do not have to complete the Foreign Service entrance exam, but who are required to have had full background investigations. Polygraph exams are not required for the State Department. The Defense Intelligence Agency is composed primarily of Civil Service Officers, who have had full background investigations, and some uniformed military officers. Many positions in DIA require a polygraph. The intelligence components of the six armed services have uniformed military officers as well as Civil Service professionals. Some agencies require at least a CI polygraph for service members assigned to those agencies. The Departments of Energy, Treasury, and Homeland Security all require full background investigations, as does the Drug Enforcement Administration. There is no polygraph for these agencies.24'