PTSD is a better term because it can come from a wide variety of sources, many of which have nothing to do with war or combat. It also recognises the disorder p

PTSD is a better term because it can come from a wide variety of sources, many of which have nothing to do with war or combat. It also recognises the disorder part explicitly (most people who go through traumatic experiences don't end up with PTSD) as well as its place in time (after the trauma, not during it, which is very unclear with 'shellshock' or 'battle fatigue').