Fullmetal Alchemist Volume 15: 02/01/12
Fullmetal Alchemist Volume 15 by Hiromu Arakawa draws on lengthy interviews with world war two vets to tell an issue long flashback about the Ishbalan war.
The story is told through a conversation between Hawkeye and Ed as she cleans her weapon. She tells of how she came to be in the military, how she and the rest of Mustang's squad were brought together and the brutality expected of the State Alchemists against the Ishbalans.
If I were teaching a history of modern warfare class, I would include Fullmetal Alchemist Volume 15 along with more traditional texts. It captures the emotional toll so well.