(U) Evaluation of DOD Law Enforcement Organizations' Response to Active Shooter Incidents [open pdf - 7MB]
From the Introduction: "(U [Unclassified]) The objectives of this evaluation were to determine whether the Department of Defense (DoD) and its Law Enforcement Organizations (LEOs):  (U) established effective active shooter incident response policies, plans, and training in accordance with DoD and Military Service requirements; and  (U) have active shooter incident response policies, plans, and training that include non-first responder LEOs, who are authorized to carry weapons on DoD facilities and installations."
Department of Defense, Office of the Inspector General, Report No. DODIG-2022-115
U.S. Department of Defense, Office of the Inspector General: https://www.dodig.mil/