The Wisconsin Army National Guard ("Guard") has dual state and federal roles, and is jointly funded and maintained by both governments. Its federal mission is to provide trained units to the United States Army in time of war or national emergency. Its state mission is to help civil authorities protect life and property and preserve peace, order, and public safety in times of natural or human-caused emergencies. The governor, who is the commander in chief of the Guard when it is not activated for federal service, appoints the adjutant general who directs the Wisconsin Department of Military Affairs, of which the Guard is a part. Members of the National Guard are typically part-time soldiers who attend unit drills one weekend per month and serve a two-week annual tour of active duty. All officers and enlisted personnel must meet the same physical, education, and other eligibility requirements as members of the active-duty services.

The Iron Brigade, also known as The Black Hats, Black Hat Brigade, Iron Brigade of the West, and originally King's Wisconsin Brigade was an infantry brigade in the Union Army of the Potomac during the American Civil War. Although it fought entirely in the Eastern Theater, it was composed of regiments from three Western states that are now within the region of the Midwest. Noted for its excellent discipline, ferocity in battle, and extraordinarily strong morale, the Iron Brigade suffered 1,131 men killed out of 7,257 total enlistments: the highest percentage of loss suffered by any brigade in the United States Army during the war.