Simon Landingham (Landingham twin, deceased, Vietnam medic)

Simon Landingham is the twin brother of Andrew Landingham and one half of a grieving family anchor in the series’ early continuity. Trained alongside his brother in medicine, he and Andrew volunteered as medics during the Vietnam War out of a desire to serve where they were needed. Killed alongside Andrew on Christmas Eve 1970 while pinned down in Đà Nẵng, Simon functions narratively as a symbol of youthful idealism and familial sacrifice, a silent presence whose death shapes Mrs. Landingham’s lasting grief and moral perspective.