Establishes the "Defend the Guard Act"

This bill, known as the "Defend the Guard Act," requires the Missouri National Guard to remain under state control unless Congress officially declares war before deploying them to active combat or hazardous foreign duties. It defines "active duty combat" as participation in armed conflicts, hazardous foreign service, or war-related duties, while explicitly allowing the governor to deploy troops for state missions under federal Title 32 authority. The legislation aims to prevent the federal government from automatically calling up state troops without a formal declaration of war, ensuring that such deployments occur only with explicit congressional approval.