During which time frame must TPI be applied to COMSEC material?

The correct time frame for applying Two-Person Integrity (TPI) to COMSEC material is from receipt through destruction, issue, or transfer. This principle is a critical security measure designed to prevent unauthorized access and ensure that sensitive communication security materials are always handled with the highest level of protection.

Applying TPI during this entire period ensures that no single individual has unilateral control or access to COMSEC material. By requiring two authorized personnel to be involved in any action regarding the material—whether it’s receiving, issuing, transferring, or destroying—it mitigates the risk of tampering or mishandling that could compromise the security of the information.

This approach to security is vital because it establishes checks and balances during critical stages of COMSEC material management. It emphasizes the importance of collaboration and oversight among personnel who handle sensitive security materials, reinforcing the integrity and confidentiality of the information those materials are meant to protect.