An homage to Kodachrome film, which is being retired after 74 years of production:
This picture, taken in Long Beach in October 1942, is from Shorpy. If you want to see the full-screen version in all its glorious detail, go there.
The caption reads:
"Women are trained as engine mechanics in thorough Douglas training methods. Douglas Aircraft Company, Long Beach, California."
4x5 Kodachrome transparency by Alfred Palmer, Office of War Information.