Which entity must approve TA appointment orders?

The correct answer is that the Local LRA (Local Registration Authority) must approve TA appointment orders. The Local Registration Authority holds a significant role in the PKI framework as it is responsible for managing and overseeing the registration of individuals and entities within the PKI environment. This includes the appointment of Trusted Agents, who play a crucial role in the issuance and management of digital certificates.

By requiring the Local LRA's approval for TA appointment orders, the PKI system ensures that all appointments are conducted in line with established protocols and standards. The Local LRA is typically more familiar with the specific needs and operational context of the unit or organization, which makes their approval essential for maintaining the integrity and security of the PKI operations.

In contrast, while Local Leadership, Department of Defense, and Army Headquarters may have overarching guidelines or policies regarding PKI, the hands-on responsibility for approving specific TA appointments lies within the Local LRA. This structure enhances accountability and operational efficiency at a local level where Trust Agents are directly involved.