A Douglas A-20 attack bomber leaves the assembly line at the Long Beach, Calif., plant for transfer to the flight line and a test flight before delivery to the Army.

Long lines of a A-20 attack bombers roll ceaselessly, night and day, through the Douglas Aircraft plant at Long Beach, Calif.

Experienced assembly line workers of both sexes contribute to the production of A-20 attack bombers in the Douglas Aircraft plant at Long Beach, Calif.

A fast, hard-hitting new A-20 i.e., B-25 attack bomber is brought for a test hop to the flight line at the Long Beach, Calif., plant of Douglas Aircraft Company

A fast, hard-hitting new A-20 i.e., B-25 attack bomber is brought for a test hop to the flight line at the Long Beach, Calif., plant of Douglas Aircraft Company Creator(s): Palmer, Alfred T., photographer Date Created/Published: 1942 Oct. Medium:.

Man and women joining in producing a vital military aircraft at the big Douglas plant in Long Beach, Calif.

A completed B-17 F heavy bomber is checked by final inspectors at the Long Beach, Calif., plant of Douglas Aircraft Company before it moves to the flight line for rigid acceptance tests.

Another North American B-25 bomber rolls off the final assembly line to join other ships on the outdoor assembly line, North American Aviation, Inc., Inglewood, Calif.

Another North American B-25 bomber rolls off the final assembly line to join other ships on the outdoor assembly line, N orth