The sources for Vietnam and WW2 are in the second link. It should be noted that nowadays there’s much more journalists than ever before. Unlike WW2 and Vietnam journalists were able to avoid areas of potential conflict more easily rather than in Gaza where Israels approach of bombing the shit out of the small strip of land has meant there virtually no place where a journalist reporting on their actions can safely do so.
Also I added a third source to the post which corroborates the Vietnam estimate.