What document outlines the policies and procedures for internal control in the Air Force?

The Air Force Instruction (AFI) is the correct choice because it serves as the foundational document that outlines the policies and procedures for various operational areas within the Air Force, including internal controls. AFIs provide extensive guidance on compliance, accountability, and oversight, ensuring that Air Force activities are conducted in an efficient and effective manner.

Unlike the other options, which focus on specific areas such as personnel management, operational directives, or training documentation, the AFI's broad scope directly addresses the establishment and maintenance of internal controls across the organization. This makes it essential for ensuring that procedures are in place to safeguard resources and maintain accountability.