Rec. 1.a: The DoD OIG recommended that the Under Secretary of Defense for Personnel and Readiness, in conjunction with the Assistant Secretary of Defense for Health Affairs and Secretaries of the Military Departments, establish a working group within 30 days of this report's publication, to address the personnel, supplies, testing capabilities, information technology, communication, and lines of authority challenges that we identified during the Coronavirus Disease-2019 pandemic that exist between the Services and the Defense Health Agency. The working group should establish milestones to develop guidance for coordinating the staffing of multi-Service military treatment facilities during a pandemic.