Which reference must be followed for investigating allegations of retaliation against victims or witnesses?

The correct reference for investigating allegations of retaliation against victims or witnesses is SECNAVINST 5370.7D. This instruction specifically addresses the Department of the Navy's policy on the prevention of harassment and retaliation. It outlines the procedures and responsibilities for investigating these allegations, ensuring that victims and witnesses are protected from further harm and that their rights are upheld during the investigation process. It is critical for maintaining a safe environment for individuals who come forward with allegations of sexual assault or misconduct, as it promotes trust in the reporting system and encourages a culture of accountability and respect.

The other references listed do not specifically focus on the investigation of retaliation or harassment. Hence, they do not provide the appropriate guidance needed for these particular cases.