Thanks for your samples. In most of these cases I personally would not use overlapping landuses but treat them as described earlier. The overlapping of military and forest is an exceptional case as military exercise areas often include large wooded areas which can be under forest management at the same time. Although the primary use of these areas (at least in Germany) is military with forestry being secondary it is common practise to overlap the 2 landuses here.
The situation OTG would be much better represented by using landuse=military + landcover=wood but unfortunately landcover is not an established key. I accept there is no established alternative here but I still dislike the inconsequence of two primary uses for a single area.