Which acronym is essential for ensuring integrity during personnel access?

The acronym that is essential for ensuring integrity during personnel access is TPI, which stands for Two Person Integrity. This concept is vital in security protocols, particularly in environments where sensitive information or materials are handled. The principle of Two Person Integrity requires that two authorized individuals be present during critical operations or access to secure areas. This measure helps to prevent unauthorized actions or access, as it minimizes the risk of collusion and mistakes, thereby reinforcing the integrity of personnel access.

In contrast, the other options serve different roles within a security framework. SOP, or Standard Operating Procedure, outlines specific operational guidelines but does not directly address integrity during personnel access. USD(I), or Under Secretary of Defense for Intelligence, is a position focused on intelligence matters within the Department of Defense, rather than a specific security measure for personnel access. TSCM, or Technical Surveillance Countermeasures, relates to the protection of sensitive information from electronic eavesdropping and is not primarily concerned with personnel access integrity. Therefore, TPI is the most relevant acronym when discussing integrity in the context of personnel access.