The DoD OIG plans to begin the subject evaluation immediately. We will determine whether the DoD's management of opioid use disorder treatment aligns with DoD policies and national guidance. We will determine whether the DoD: (1) has policies and programs in place to manage the treatment of opioid use disorder for Military Health System beneficiaries; (2) identified and resolved programmatic barriers to treatment for individuals diagnosed with an opioid use disorder; and (3) established and implemented opioid use disorder treatment outcome and process measures to inform quality improvements, in accordance with DoD policies and national guidance.