Not my field at all, but I was always under the impression that swagger sticks weren't carried by anyone below NCO rank. However, it does look like a swagger stick. Another (small) possibility is that it may be a practice chanter - the fingered bit of a bagpipe but a blow-in version to avoid having to carry the full bag kit around. Admittedly, it looks too thin to be that, but then the image isn't any too clear.