Australia seems to specialise in these sorts of songs. This one is probably the best known - about WW1 - but pretty timeless in its meaning. I like this rendition by Eric Bogle, who wrote it. Recorded in a crowded club on a Saturday night rather than his usual clean studio recording.
Usually you can not hear yourself think in these places but the song has such an impact that the noisy start quickly subsides into a low background hum (I suspect mainly young women).
https://www.youtube.com/watch?v=E22gszljklc
While I am at it may as well put up another Australian Vietnam anthem Khe Sanh
https://www.youtube.com/watch?v=dTjvG4WJD_A