What PSI type is necessary for NC2 (Nuclear Command and Control) determinations?

The correct choice for the required Personnel Security Investigation (PSI) type for Nuclear Command and Control (NC2) determinations is the Single Scope Background Investigation (SSBI).

The SSBI is a comprehensive investigation that examines an individual's life and background to determine their eligibility for access to classified information or assignment to sensitive positions, which is critical in the context of NC2. This investigation includes an in-depth review of personal history, employment records, education, and interviews with associates, which helps to assess the trustworthiness and reliability of the individual seeking such sensitive access.

In the case of NC2, given the high-stakes nature of nuclear operations and the potential impact on national security, the SSBI is designed to provide the level of scrutiny necessary to ensure that personnel in these roles can be trusted with significant responsibility. It incorporates more elements than lesser forms of background checks, such as the National Agency Check or Access National Agency Check with Inquiries, which may not provide the same depth of investigation required for positions that operate within the nuclear command structure. Similarly, the Enhanced Background Investigation, while comprehensive, does not meet the specific requirements laid out for NC2 determinations.