If individual does not pass the CON exam, do they have to retake any training?

After each unsuccessful exam attempt, the individual and their Agency will be notified of the results. The Agency will determine any required remedial actions to include retaking training, mandatory time between subsequent attempts, and Agency “counseling.” At each unsuccessful attempt, DoD recommends individuals review their exam performance feedback in detail.
After the third unsuccessful attempt to take the exam in a 12-month period, individuals must review their exam performance feedback and the associated study materials obtained from the course. All remedial steps the individual took should be confirmed and endorsed by their Agency before they are allowed to attempt the exam again.