If you die to protect others, then yes, it is. If you die to kill others with no thought of protecting another, then it is not good. If you step in front of a bullet to save someone, that is heroic. If you die trying to cause carnage, you got what was coming to you.
War on this earth is unavoidable because great power will always take advantage of lesser power. Diplomacy cannot work with parties that have malicious intent as learned from WWII and the appeasement of the Nazis. One cannot make a compromise with someone who cannot be trusted. If the Nazis did not have an intention of taking over Europe, Chamberlain could have trusted the Germans not to take over the rest of Czechoslovakia after the Warsaw Pact.
Therefore, military strength by the peaceful will always be necessary to keep malicious power from taking advantage of the peaceful.
If you get right down to it, I think that it is a noble way to die. It is sacrificing yourself for your loved ones, and a cause greater than self, in a situation that calls for tremendous courage. However, I also think that we anxiously await the day when combat is obsolete. If there was ever a defensive, home-battled war, I would be more than happy to rise up in arms, but until that point, I don't see any politician worth dying for.
Let the old men fight their own wars, not the young. If the old are willing to stand by their convictions, then they should be prepared to sacrifice their lives for their ideals. Conflicts between nations should be taken care of by having the leaders and/or politicians of those nations fight to the death in a ring or small battlefield. Whomever survives can be declared the victor nation.
Since we haven't been in a just war (America) since WWII, no, I would not die for this nation.
But if we were to engage in an actual war, with an actual enemy for actual good, then yes, I would.
I would also lay down my life to protect my nation from an invading force. Without reservation.
People often equate an unwillingness to die for an unjust cause with an unwillingness to serve the nation. We just don't want to die for no good reason.
Of course there will be always those who will make conflict unavoidable but as long as I have a choice I will opt for a peaceful resolution and therefore condemn war and find its casualties a waste and unnecessary grief for those left behind. Apart from the fact that soldiers often suffer from the post traumatic stress of their work.