This is Fort Riley, one of the largest army bases in the country.
Fort Riley is a United States Army installation located in Northeast Kansas, on the Kansas River, between Junction City and Manhattan. The Fort Riley Military Reservation covers 100,656 acres (407 km²) in Geary and Riley counties and includes two census-designated places: Fort Riley North and Fort Riley-Camp Whiteside. The fort has a daytime population of nearly 25,000.