Which DEFCON level indicates a state of alert for potential military action?

DEFCON 2 indicates a significant state of alert for potential military action. At this level, the armed forces are ready to deploy or engage in combat operations within hours. DEFCON 2 signifies that the situation is escalating and military readiness is heightened to a serious degree, reflecting an imminent threat that requires preparedness for possible conflict.

In contrast, DEFCON 5 represents a normal, peacetime status, while DEFCON 4 involves increased intelligence and readiness but does not imply an immediate threat. DEFCON 1 indicates maximum readiness and the immediate prospect of nuclear war, which is beyond just preparation for conventional military action. This context illustrates why DEFCON 2 is correctly associated with a heightened state of alert for potential military action.