Evaluation of the United States Military Support of Department of Homeland Security Southern Border Security Operations Under Title 10 Authority [Redacted] [open pdf - 6MB]
From the Objective: "The objectives of this evaluation focused on the use of DoD title 10 personnel supporting Department of Homeland Security (DHS) southern border security operations. Specifically, we determined whether the:  use of DoD title 10 personnel to support DHS southern border security operations was authorized by Federal laws and consistent with DoD policies;  DoD's support of DHS southern border security operations complied with applicable Federal laws and was consistent with DoD policies;  DoD title 10 personnel supporting the DHS were provided adequate training consistent with Federal laws and DoD policies on the Standing Rules for the Use of Force (SRUF) and on potential reaction to contact with civilians or migrants; and  use of DoD funds for DoD title 10 support to DHS southern border security operations complied with applicable Federal laws and DoD policies."
Department of Defense, Office of the Inspector General Report No. DODIG-2020-115
Department of Defense Office of Inspector General: https://www.dodig.mil/