Which document must all COMSEC material held or used by a watch station be accounted for on?

The document that all COMSEC material held or used by a watch station must be accounted for on is the watch-to-watch inventory. This inventory serves as a crucial accountability measure that ensures all sensitive communications security material is properly tracked and secured between shifts. It involves a systematic check where the incoming watch verifies the availability and condition of COMSEC items from the outgoing watch.

Using a watch-to-watch inventory helps to minimize the risk of loss or unauthorized access to COMSEC materials, which are critical for maintaining operational security. This process reinforces accountability and provides documentation that can be reviewed if discrepancies arise, thus promoting discipline and standard operational procedures concerning sensitive information.

Other documents, such as the Daily Log or Action Item Report, may contain valuable operational information, but they do not specifically focus on the inventory and accountability of COMSEC materials. The COMSEC Equipment List is important for listing equipment but does not serve the immediate purpose of ensuring that all items are accounted for at the end of a watch cycle like the watch-to-watch inventory does.