You earn it. The word miller said in the end of the movie indicate the theme of the movie. All the soldiers died for you,for this country. So you are the one who can come back US to live a better life. That means America has a hope,we as a humanbeing has a hope.
The real scene of Second World War shakes my heart. The war is so cruel that it takes away your family members and breaks up the peaceful life you are supposed to have. So everyone in this world hope they live in a peaceful society.
Is it worth doing something? Everybody may has different answers for the same question,meaning that every individual has their own way of judging the life he has.