What does the Defense Manpower Data Center (DMDC) primarily contain?

The Defense Manpower Data Center (DMDC) is primarily focused on maintaining comprehensive records and data related to the military and civilian workforce associated with the Department of Defense. This includes detailed personnel information regarding active duty service members, reserve forces, and civilian employees. The DMDC serves as a centralized repository for essential data, which supports various functions, such as manpower management and planning, benefits administration, and security clearance processes.

The other options involve data types and repositories that do not align with the primary role of the DMDC. Publicly available court records fall outside the purview of military personnel data management. Data from social security systems is managed by different agencies and is not a focus of the DMDC. Additionally, international personnel databases typically relate to foreign military or personnel records rather than American military or civilian records. Therefore, the primary content of the DMDC is indeed active duty and civilian personnel files, making this the correct answer.