When is DEFCON 3 typically declared?

DEFCON 3 is typically declared when there is a credible threat requiring heightened readiness. This level of defense readiness is one step below full-scale war and indicates that military forces are preparing for potential conflict. At DEFCON 3, forces may be fully mobilized and ready to engage in combat operations if necessary, but active combat is not yet underway. It serves as a critical alert level that signals increased vigilance and the need for immediate operational readiness, which is essential for responding effectively to looming threats.

In contrast, the other scenarios described do not align with the declaration of DEFCON 3. Peacetime operations do not usually necessitate such heightened readiness. A chemical attack would likely prompt a different response based on the specific circumstances involved, and international peace negotiations would not trigger a readiness level of this nature, as they typically work towards reducing tensions rather than escalating them. Thus, the context and purpose of DEFCON 3 revolve around preparing for immediate threats rather than the other circumstances outlined.