In which scenario should the watch-to-watch inventory be conducted?

The watch-to-watch inventory should be conducted when personnel changes occur to ensure that all items related to communication security (COMSEC) are accurately accounted for and properly transferred to the incoming personnel. This is crucial because when new personnel take over, they need to verify that they have all the necessary materials and that any sensitive items have been correctly secured. Conducting an inventory during transitions helps maintain the integrity of security protocols and reduces the risk of mismanagement or loss of COMSEC materials.

Other scenarios, such as conducting inventories on a monthly basis, during audits, or at the beginning of each quarter, do not specifically address the immediate need for accountability and verification that arises when personnel changes happen. Although regular audits and periodic inventories can contribute to overall security and accountability, they are not as critical as ensuring proper transfers during personnel changes.