Which government agency oversees the NISP?

The Defense Counterintelligence and Security Agency (DCSA) is the correct choice because it is specifically designated as the agency responsible for overseeing the National Industrial Security Program (NISP). The DCSA manages and implements security clearance processes for contractors that handle classified information and works to ensure that these entities comply with all applicable regulations under the NISP.

DCSA plays a critical role in safeguarding national security by providing oversight and guidance to both government and private sector organizations involved in national defense. This includes conducting training, compliance inspections, and providing resources necessary for managing sensitive information effectively.

While other agencies, such as the FBI and CIA, serve important functions related to national security and intelligence, their roles are not focused on managing the NISP. The Department of Homeland Security (DHS) is involved in broader security issues, but it does not have oversight over the NISP specifically. Thus, DCSA stands out as the primary authority in charge of the NISP.