The answer to that is no. I would not die for any country on this planet. I see no country on this planet as worth dying for.
I'd join the army, but only if I was in charge. And no, I wouldn't be prepared to die for my country. When you are dead you have no country.
I have fought in one war (as a combatant) and I was involved in 4 other wars (as a non-combatant). I would most certainly fight if my country were invaded by another nation if felt the invaders were "the bad guys". Simply attacking my country doesn't mean I think that we are "the good guys". It all depends. I would not expect everyone else to do the same as I.