p.s. look at the chair shadow, the light does seem to come from the left and possibly the height of those poles. It would make sense for those. (They are also brighter lit at the top, with a sharp drop of in brightness) And a guy in the military taking professional photos might not have actually been a professional photographer, depending on what the photos were for.
p.s. Oh an also they could be close together to form one light source to create better shadows. It is a small room and if they were farther apart it might look weirdly lit.
