Redstone Arsenal is a United States Army base and Census-designated place adjacent to Huntsville, Alabama in the Wheeler National Wildlife Refuge. A census-designated place in Madison County, Alabama, United States, it is part of the Huntsville-Decatur Combined Statistical Area. The arsenal hosts over 75 tenant agencies including many that are part of the Department of Defense such as the United States Space Command, NASA's largest field center, and Department of Justice agencies including the Federal Bureau of Investigation.