I think we have a problem with the sentence: "This course is mandatory for all DoD personnel with access to controlled unclassified information."
Not speaking for everybody, but DoD Inst 5200.48 says the following for OSD and DoD Component Heads: "Ensure their personnel receive initial and annual refresher CUI education and training, and maintain documentation of this training for audit purposes."
We have our own training that we have to take and can provide the certificate. Are you saying members outside DoD, to include coalition partners and other USG, have to take your CUI training before being provided access to a CUI site?