Defcon Level Usa Today. Defcon 5 is the lowest state of readiness, while defcon 1 is maximum readiness, meaning a nuclear war is about to begin or already has begun. Each defcon level is going to present a new threat level, parameters that characterize the threat, and the readiness of the military.
When was defcon 2 last activated? Defcon 3, or round house is an increase in alertness and military readiness, also known as ‘yellow alert’ status.