<Tr> <Td> Alabama </Td> <Td> Maxwell Air Force Base </Td> <Td> Mississippi </Td> <Td> Columbus Air Force Base </Td> </Tr> <Tr> <Td> Alaska </Td> <Td> Clear Air Force Station </Td> <Td> Keesler Air Force Base </Td> </Tr> <Tr> <Td> Eielson Air Force Base </Td> <Td> Missouri </Td> <Td> Whiteman Air Force Base </Td> </Tr> <Tr> <Td> Joint Base Elmendorf Richardson </Td> <Td> Montana </Td> <Td> Malmstrom Air Force Base </Td> </Tr>

What is the largest military installation in the united states