Creator Dan Fogelman co-wrote tonight's episode with writer and Vietnam vet Tim O'Brien, known best for his book The Things They Carried. Much of what Jack goes through is even based on O'Brien's time in Vietnam, but obviously adjusted to This Is Us' style of storytelling.
"I just wanted to get the experience correct, like in our way," Fogelman tells E! News. "I think doing a 45 minute episode of television that's just a gun battle wouldn't be of our show and what we do."