What does it mean to set 'material condition zebra'?

Setting 'material condition zebra' indicates a readiness to respond to a potential attack. This condition is a heightened state of alert where the personnel are prepared for immediate action against threats, particularly in naval terms, signaling that the ship or unit is recognizing the potential for hostilities and is taking necessary precautions. This includes securing sensitive areas, enhancing watch duties, and ensuring that all crew members understand their roles during an imminent threat. The emphasis is on preparing for possible aggression rather than indicating that a secure environment or no threat is present, which would be reflected in more relaxed conditions.