"The Women's Army Corps (WACs), first organized as an auxiliary May 14, 1942, became 'regular army' a little more than a year later...They were secretaries and stenographers for generals. They operated switchboards which kept communications alive throughout the European theater of operations...Their keen eyes and quick fingers made them expert as parachute riggers. They became weather experts [charting the aerial routes for the long-range bombers of the U.S. Eighth Air Force]."
140,000 women served as WACs during W.W. II.
During the Second World War, hair dye was not simply used by women;although this article said that the number was more like 100,000; click here to read that article.
Read about the WACs in the Korean War...