Honoring the fallen.
I frequent political discussions on blogs and forums. A frequently asked questions, typically by Europeans, is "what is Patriotism?" My response:
Patriotism is a commitment to the nation-state of which you are a member of, to continue the works others have done to create and improve it. This sometimes means dying to preserve it. This sometime means criticizing it. There is an order of priority: firstly preservation, secondly improvement. As it entails both commitment and work toward a better state, it would be a wasted effort if you do not feel proud of your commitment and work. And as a corollary, be appreciative of the contribution by others toward the same goal.