What will happen if a unit fails to meet the Phase 4 exit criteria?

The correct choice is that if a unit fails to meet the Phase 4 exit criteria, it will require a full 3-M recertification. This process ensures that standards of maintenance and material management are upheld, and if a unit does not pass the Phase 4 evaluation, it indicates that they are not fully compliant with the necessary requirements and practices defined in the 3-M program. A full recertification focuses on addressing any deficiencies and ensuring that the unit can meet the standards and obligations of the maintenance management system. This is key to maintaining operational readiness and effectiveness within the fleet.

In contrast, additional training typically serves as a remedy for units struggling in the earlier phases, but it does not suffice if a unit has not demonstrated the necessary proficiency to exit Phase 4. Continuation with inspection cycles would not apply in the context where exit criteria are not met; instead, the focus would shift to rectifying the issues leading to the failure. An automatic extension might be a consideration in some scenarios, but it is not standard protocol for failing to meet critical exit criteria, which necessitates a more thorough evaluation and recertification process.