I thought of laundry as well. I disagree that this is something a soldier might do, but not a woman. First a soldier that might be inspected would not likely place their uniform on the ground. There are a lot of other period images of soldiers drying clothes on a rope clothesline.
Second, why would you place them on the ground to dry in front of the headquarters building??? Very odd.
Wondering if it was done by one of the staff at the hospital.