The area's World War II Army Air Fields had employment increase from approximately 3,700 in December 1939 to over 50,000 at the war's peak. Wright Field grew from approximately 30 buildings to a facility with some 300 buildings and the Air Corps' first modern paved runways. The original part of the field became saturated with office and laboratory buildings and test facilities. The Hilltop area was acquired from private landowners in 1943–1944 to provide troop housing and services. The portion of Patterson Field from Huffman Dam through the Brick Quarters (including the command headquarters in Building 10262) at the south end of Patterson Field along Route 4 was administratively reassigned from Patterson Field to Wright Field. To avoid confusing the two areas of Wright Field, the south end of the former Patterson Field portion was designated "Area A", the original Wright Field became "Area B", and the north end of Patterson Field, including the flying field, "Area C."