Fort Chaffee Maneuver Training Center is an Army National Guard installation in western Arkansas, adjacent to the city of Fort Smith, and one mile (1.6 km) southeast of Fort Smith Regional Airport. The Arkansas River flows eastward along the northern border of the post and Interstate 40 is five miles (8 km) to the north on the opposite side of the river. Fort Chaffee is primarily used as a training facility by regional National Guard and Army Reserve units and active military units from other installations. Fort Chaffee is now under the control of the Arkansas Army National Guard; at this time, no active Regular Army units are permanently stationed at the post.