What resource is a detailed manpower listing that reflects manpower allocations by work center?

The correct answer is the Unit Manpower Document (UMD) because it serves as the official source that details manpower allocations for a unit by work center. The UMD outlines the positions authorized for a unit, including the specific roles and responsibilities attributed to each work center. This document is critical for ensuring that a unit is staffed according to its operational requirements and helps in planning personnel assignments effectively.

In contrast, other resources do not provide the same level of detail regarding manpower allocations by work center. For example, the Unit Personnel Management Roster (UPMR) is a list of personnel assigned to a unit but does not indicate allocations by specific work centers. The Unit Authorization File is primarily used for tracking authorization and status, while the Alpha Roster is a simple listing of personnel that includes names in alphabetical order without the detailed allocation information found in the UMD. Thus, the UMD is the resource that contains the necessary detailed information about manpower allocations.