Part of the cowling for one of the motors for a B-25 bomber is assembled in the engine department of North American Aviation's Inglewood, California plant, October, 1942. One of the most dramatic changes during World War II was the number of women who went to work. As the armed forces filled its ranks with manpower, industry filled its jobs with womanpower. Conditions were sometimes harsh and pay was not always equal, the average man working in a wartime plant was paid $54.65 per week, while women were paid about $31.50. The North American B-25 Mitchell was an American twin-engined medium bomber manufactured by North American Aviation. It was used by many Allied air forces, in every theater of World War II, as well as many other air forces after the war ended, and saw service across four decades.