Removing classification markings from a document is considered:

Removing classification markings from a document can indeed be viewed as a possible insider threat indicator. This behavior may raise suspicions about an individual's intent, as it could suggest an attempt to disclose sensitive information without authorization. In the context of security and intelligence, maintaining the integrity of classification markings is crucial for protecting national security. When someone removes these markings, it can signal that they might be attempting to manipulate or mishandle classified information, which is a serious matter that requires scrutiny.

The integrity of classification labels helps ensure that individuals handle documents appropriately according to their sensitivity. When this integrity is compromised, it can lead to unauthorized access or dissemination of critical information. Thus, the presence of missing classification markings can be a red flag for security personnel, prompting further investigation into the motivations and actions of the individual involved.