Morning Child is another war story, I think a theme for the collection it is in. The weapons are fantastic, but they have passed beyond understanding. Williams and John pass their days in a depopulated post-apocalypse world, near the ruins of their old home.
To describe the story further would be to fully quote it. It's pretty short, nominated for a Nebula Best Short Story in 1984. It's a good short story--the relationship brings out what has happened to them, not any sort of exposition. Except toward the end, where it adds poignancy. Read it to fill a few minutes. Three stars, kind of by default.