I don't get it (then again I don't get a lot of things) but I still don't see or, rather, cannot envisage, why a military would want to operate in cities. I can understand a domestic COIN / Law enforcement operation or counter-terrorism mission but seriously if you are an invading army why not just isolate a city and exhaust the offending inhabitants. No city can survive without a hinterland. Hell, if it worked for Caesar why not now? All I read and hear is a regurgitation of attritionist fetishes.