Which of the following would be considered proprietary information in the military context?

Proprietary information in the military context refers to data and details that are confidential and critical to the operations and security of the organization. Personnel identification numbers fit this definition because they are unique identifiers assigned to military members that can be used to access sensitive information about their service and personal records. This information is not meant for public dissemination, as its exposure could lead to issues like identity theft, unauthorized access to military systems, or breaches of privacy.

In contrast, general training schedules, open-source project plans, and public event announcements do not fall into the category of proprietary information. General training schedules are often shared for planning purposes and do not contain sensitive data. Open source project plans are publicly accessible and do not involve confidential military operations. Public event announcements are intended for dissemination to inform the community and do not typically include proprietary content. Thus, personnel identification numbers are vital for protecting individual privacy and securing military operations, demonstrating their status as proprietary information.