Which PSI is conducted on enlisted military members for access to Confidential and Secret information?

The correct answer is the National Agency Check with Local Agency and Credit Checks. This is specifically designed for enlisted military members who are seeking access to Confidential and Secret information. The process includes checks against national databases and also involves local law enforcement and credit checks to assess the individual's reliability, trustworthiness, and overall suitability for handling classified information.

In the context of personnel security, this level of investigation is appropriate for positions that require access to information that is sensitive but does not necessitate the more extensive checks involved in higher-level investigations, such as the Single Scope Background Investigation, which is generally reserved for those needing access to more classified information. This highlights the tailored approach to security clearance processes based on the sensitivity level of the information an individual may access.