War preparations?

Another one of those great but mysterious old family photos, in which I do not recognize any of the people. This seems to be a group of young women getting training to dress head wounds, perhaps because World War I has begun (just guessing about the approximate date from the clothing styles).

I've never understood why you would need to practice winding gauze around someone's head; it looks fairly easy to do.

Notice how poorly the blackboards have been erased. I remember my first grade teacher washing her blackboard with a wet cloth - they need someone to do that in their classroom. 

Let's look a little closer.

How calmly she stares at us from the past, this unknown woman.