Groves initially established the headquarters of the AFSWP in the old offices of the Manhattan Project on the fifth floor of the New War Department Building in Washington, DC, but on 15 April 1947 it moved to the Pentagon.[20] As AFSWP headquarters expanded, it filled up its original accommodation, and began using office space in other parts of the building, which was not satisfactory from a security point of view. In August 1949, it moved to 18,000 square feet (1,700 m2) of new offices inside the Pentagon. This included space for a soundproof conference room, a darkroom, and vaults where its records and films were stored.[21]