What list gives the operations manager a firm grasp of who is available for deployment?

The Unit Manning Personnel Roster (UMPR) is the correct answer because it provides a comprehensive overview of personnel assigned to a unit, including their availability for deployment. This roster details each individual's status, qualifications, and readiness to be assigned to missions or operations, allowing the operations manager to assess quickly who can be deployed at any given time. The UMPR serves as an essential tool in managing personnel effectively, ensuring that leadership has the necessary information to make informed decisions about staffing and operational readiness.

In contrast, other lists like the Deployment Readiness List and the Personnel Training Roster focus more on readiness aspects such as training status or specific deployment capabilities without offering a complete picture of personnel availability. The Mission Readiness Statement, on the other hand, is more concerned with overall mission preparedness rather than the details of individual personnel’s availability for deployment.