Which document would contain changes to authorized positions?

The Unit Manning Document (UMD) is the correct choice because it serves as a detailed representation of the personnel positions authorized for a specific unit or organization. It outlines the number of positions, titles, and grades, ensuring clarity on staffing levels and needs. When there are changes to authorized positions, such as additions, deletions, or reallocations, these updates are reflected in the UMD. This document is crucial for managing human resources effectively, aligning personnel resources with operational requirements.

The other options do not serve this purpose. A Meal Card Roster is typically used to track meal entitlements for personnel, and does not reflect staffing changes. A Lodging Spreadsheet usually contains information about accommodations and housing assignments rather than personnel positions. Training Records Document tracks individual training achievements and curriculums and does not pertain to organizational staffing or position authorizations.