Tattoos maybe?
I guess it could work if its facial tattoos or arm ones if the army wear uniforms that have short or no sleeves. There might even be a certain leeway in the actual rendition of the image if for example a given award is shown by an abstract design (3 wavy lines) or objects (crossed riffle and sword).
Probably the government would pass some sort of law to prevent people from displaying tattoos they are not entitled to.