Which form documents periods of unauthorized absence exceeding 24 hours?

The correct choice documents periods of unauthorized absence exceeding 24 hours because it serves as a formal record of a service member's absence from duty, outlining crucial details about the duration and nature of the absence. This particular form is utilized in the official service record to ensure that any unauthorized absence is noted appropriately, allowing for proper administrative action to be taken if necessary.

This documentation is critical in maintaining accurate personnel records and ensuring that all absences are accounted for in terms of military readiness and discipline. It helps command to assess the impact of such absences and manage personnel effectively, reinforcing the importance of following regulations and maintaining proper communication regarding attendance.