Contractors drill at the site of the new Van Voorhis Elementary School in Fort Knox, Kentucky, March 28, 2022. Possible negative impact from wet clay soil has required the installation of about 200 concrete pillars to support the building foundation. U.S. Army Corps of Engineers, Louisville District is managing the construction of the 21st century Department of Defense Education Activity school. (U.S. Army Corps of Engineers photo by Charles Delano)