Here's what I think (presently; don't deport me, bro): it depends a lot on who wants to save "the country". For all the nationalism that exists, I'm not so sure there are many agencies available that'll act together to keep the nation in one piece. This is at least in part caused by how power is organised. Which is to say, there really is only one (barely) constituted authority and that's the Party. In a crisis like a Zompocalypse, if the Party were unable to compel the various agencies to follow a bunch of selfless institutional policies meant to protect the country and the citizens, then local power groups would take over and act like gangs and create fiefdoms. (Then a zombie would find them all drunk off their tits at karaoke and that would be that.) As it happens, I suspect the present paramount general leader secretary could pull it off. The party at present, at least as far as I understand it from the news, could possibly successfully coordinate a nationwide zombie counter-offensive. What form that counter-offensive would take.... I don't know.