How must the equipment used for aircrew flight equipment continuation training be marked?

The correct choice emphasizes that equipment used for aircrew flight equipment continuation training must be clearly marked "FOR TRAINING USE ONLY." This marking is crucial as it helps distinguish the equipment designated specifically for training purposes from that which is intended for operational or flight use. Proper labeling ensures that trainees and instructors alike understand the limitations of the equipment and mitigates the risk of using non-operational gear in flight scenarios, which could jeopardize safety and training integrity.

This practice conforms to safety protocols and training regulations that prioritize the effective use of flight equipment within a controlled training environment. By marking the equipment specifically for training, it reinforces the importance of using only certified operational gear during actual flight operations, thus preserving the readiness and safety of aircrew members in real-world settings.