How often must DoD and contractor personnel receive refresher training on derivative classification principles?

Refresher training on derivative classification principles is required every two years for both Department of Defense (DoD) personnel and contractors. This periodic training is essential to ensure that individuals stay current with the evolving policies, practices, and security requirements related to classification. The two-year interval strikes a balance between providing adequate knowledge retention and keeping personnel informed about any updates or changes to derivative classification procedures. Regular training helps to enhance security awareness and compliance with regulations that govern the handling of classified information.