Which instruction would be best to consult regarding access for foreign visitors?

The instruction that provides guidance on access for foreign visitors is SECNAVINST 5510.34A. This instruction specifically outlines the guidelines and policies related to personnel security program management, which includes the necessary protocols for granting access to foreign nationals. It details the processes that must be followed to ensure that security measures are adhered to when foreign visitors are involved, including any background checks and security assessments required.

Consulting this instruction ensures that all personnel understand their responsibilities when it comes to managing access for foreign visitors, thus enhancing the overall security of sensitive information and assets. The policies outlined in this instruction help prevent unauthorized access and maintain the integrity of operations, which is vital for national security.