Switch boxes on the firewalls of B-25 bombers are assembled by women workers at North American Aviation, Inc.'s Inglewood, Calif., plant

Switch boxes on the firewalls of B-25 bombers are assembled by women workers at North American Aviation, Inc.'s Inglewood, Calif., plant

Part of the cowling for one of the motors for a B-25 bomber is assembled in the engine department of North American Aviation, Inc.'s Inglewood, Calif., plant

Part of the cowling for one of the motors for a B-25 bomber is assembled in the engine department of North American Aviation, Inc.'s Inglewood, Calif., plant

An experimental scale model of the B-25 plane is prepared for wind tunnel tests in the plant of North American Aviation, Inc., Inglewood, Calif. This plant produced the B-25 bomber

An experimental scale model of the B-25 plane is prepared for wind tunnel tests in the plant of North American Aviation, Inc., Inglewood, Calif. This plant produced the B-25 bomber

P-51 ("Mustang") fighter plane in construction, North American Aviation, Inc., Los Angeles, Calif.

P-51 ("Mustang") fighter plane in construction, North American Aviation, Inc., Los Angeles, Calif.

Employees at North American Aviation, Incorporated, assembling the cowling on Allison motors for the P-51 fighter planes, Inglewood, Calif.

Employees at North American Aviation, Incorporated, assembling the cowling on Allison motors for the P-51 fighter planes, Inglewood, Calif.

P-51 ("Mustang") fighter planes being prepared for test flight at the field of the North American Aviation, Inc., plant in Inglewood, Calif.

P-51 ("Mustang") fighter planes being prepared for test flight at the field of the North American Aviation, Inc., plant in Inglewood, Calif.

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Making the B-25 Bomber at North American Aviation, Inc., 1942