A second major change was made to the plaza in 1958. President Dwight Eisenhower signed legislation in August 1956 to allow the interment of unidentified remains for soldiers from World War II and the Korean War at the Tomb of the Unknowns. Two new burial vaults, to the northwest and southwest, were dug in the plaza before the eastern entrance hall. Carved into the granite in front of the tomb sarcophagus were the dates "1917-1918". The Korean War unknown was interred in the northwest vault beneath a slab with the dates "1950-1953" carved into its western edge. The World War II unknown was interred in the southwest vault beneath a slab with the dates "1941-1945" carved into its western edge. The cover slabs of both new vaults were flush with the plaza. The two unknowns were interred on Memorial Day on May 30, 1958.