Question: Which US Army post part of the Huntsville-Decatur Combined Statistical Area replaced cotton as an economic force in Madison Station Historic District?
Sentence (from "Redstone Arsenal"): Redstone Arsenal (RSA) is a United States Army post and a census-designated place (CDP) adjacent to Huntsville in Madison County, Alabama, United States and is part of the Huntsville-Decatur Combined Statistical Area.
Relevant evidence: Yes