Owens Cross Roads is a town in Madison County, Alabama, United States, and is included in the Huntsville-Decatur Combined Statistical Area.
 It was incorporated in 1967.
 As of the 2010 Census, the population of the town was 1,521.
The Madison Station Historic District is a historic district in Madison, Alabama.
 Madison was first settled around 1818 as a farming community, but significant growth began in 1858, when the first depot was built along the Memphis and Charleston Railroad line.
 Madison Station became an important loading point for the shipment of cotton, supplanting the Tennessee River as the preferred means of shipment.
 Merchants and other businesses soon followed, with many people moving from the river port of Triana.
 After a lull during the Civil War, the town's growth continued; Madison was incorporated in 1869.
 The town grew steadily until the 1950s, when industry spurred by the expansion of Redstone Arsenal replaced cotton as the primary economic force in Madison County.
Toney is an unincorporated community in the northwestern part of Madison County, Alabama, United States.
 A part of the Huntsville-Decatur Combined Statistical Area, it is located at an elevation of 827 feet (252 m).
New Hope is a city in Madison County, Alabama, United States, and is included in the Huntsville-Decatur Combined Statistical Area.
 As of the 2010 census, the population was 2,810.
Madison is a city located primarily in Madison County, near the northern border of the State of Alabama.
 Madison extends west into neighboring Limestone County.
 The city is included in the Huntsville Metropolitan Area, the second-largest in the state, and is also included in the merged Huntsville-Decatur Combined Statistical Area.
 As of the 2010 census, the population of the city was 42,938.
 Madison is bordered by Huntsville on all sides.
Neel ( ) is an unincorporated community in western Morgan County, Alabama, United States.
 It is located south of Decatur and west of Hartselle at the 5-way stop intersection of Ironman Road, Danville Road, and Neel School Road.
 For statistical purposes, Neel is included within the Decatur Metropolitan Area which is, in turn, part of the Huntsville-Decatur Combined Statistical Area.
 A post office operated under the name Neel from 1890 to 1906.
New Market is a census-designated place (CDP) in Madison County, Alabama, United States, and is included in the Huntsville-Decatur Combined Statistical Area.
 As of the 2010 census, the population of the CDP is 1,597.
 Although it was the first area settled in Madison County, the town has never been incorporated.
Harvest is an unincorporated community and census-designated place (CDP) in the northwestern part of Madison County, Alabama, United States, and is included in the Huntsville-Decatur Combined Statistical Area.
 As of the 2010 census, the population of the community is 5,281.
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.
 The Arsenal is a garrison for a number of tenants including the United States Army Materiel Command, Army's Aviation and Missile Command, the Missile Defense Agency of the Department of Defense, and NASA's Marshall Space Flight Center.
 Many of these units are moving due to decisions by the Defense Base Realignment and Closure Commission.
 The Redstone Arsenal CDP had a population of 1,946 as of the 2010 census.
 The base contains a government and contractor workforce that averages 36,000 to 40,000 personnel daily.
Triana ( or [tʃɹaːˈɛnə] ) is a town located on the southern county line of Madison County, Alabama, United States, and is included in the Huntsville-Decatur Combined Statistical Area.
 As of the 2010 census, the population of the town was 496.

Question: Which US Army post part of the Huntsville-Decatur Combined Statistical Area replaced cotton as an economic force in Madison Station Historic District?
Answer: Redstone Arsenal