Which colors should never be used when marking a LZ/PZ with chem lights?

When marking a Landing Zone (LZ) or Pickup Zone (PZ) with chemical lights, it is crucial to adhere to specific color conventions to ensure clear communication and safety during operations. The color blue is typically used to indicate a safety zone for aircraft, while green is often associated with a go or clear status.

Using blue and green can create confusion, as these colors may not effectively communicate the intended message, particularly in high-stress or chaotic environments. Therefore, these colors should not be utilized for marking LZ/PZ areas where clear and immediate recognition is vital.

The correct answer underscores the importance of adhering to established color codes for clarity and operational efficiency in air assault missions.