By the mid‑1940s the Navy Yard and the expanded Annex area reached peak production with 26,000 employees in 132 buildings on 127 acres ( 0.51 km2 ) of land .
By the mid-1940s in wartime the Navy Yard and the expanded Annex area were making the most ammo with 26,000 employees in 132 buildings on 127 acres ( 0.51 km2 ) of land .