Which option correctly lists the three Air Defense Warning Levels and their meanings?

• A. White — attack not probable; Yellow — attack probable; Red — attack imminent or in progress
• B. White — attack imminent; Yellow — attack not probable; Red — attack probable
• C. White — attack probable; Yellow — attack imminent; Red — no attack
• D. White — attack not probable; Yellow — attack probable; Red — attack imminent or in progress

Answer: (D)

The three air defense warning levels form an escalating scale of threat and corresponding actions. White means the attack is not probable, signaling normal readiness. Yellow indicates the attack is probable, prompting heightened alert and increased preparedness. Red signifies the attack is imminent or already in progress, requiring immediate defensive measures. This progression aligns with moving from normal operations to heightened alert and then to active defense. Other mappings place the meanings in the wrong order or assign imminent or no attack to the wrong level, which would break the intended sequence and response.