Perhaps this is a well-known photo, so I apologize in advance.
The photo shows members of the Women's Reserve Camouflage Corps (a sub-group of the American organization, National League of Women's Services) applying camouflage paint to a vehicle in a predetermined pattern. Photo was taken in New York City, 1918.
Well, the first thought has to be that it's for parade/dummy/recruiting purposes. Not quite, but close. A bit of a google of "Women's Reserve Camouflage Corps," and we get, to my surprise, a Wikipedia article and this:
Quite a bit of other interesting stuff on this site.
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"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.