This Is Us season 3 will be a bit lighter than last season, according to Isaac Aptaker (co-showrunner) but will be emotional all the same. A good chunk of the storyline will take place in Vietnam. Jack (Milo Ventimiglia) and his little brother Nicky (not announced) served together there at some point in Jack’s younger days. It’s something we knew if we paid close attention to a photo that Jack would bring out now and again of he and his bro. Issac says “I can’t tell you who we’ve cast to play Nicky just yet — but, yes, we are going to be spending a lot of our time in Vietnam.” One more thing we learned was that the season 2 finale “Flash-Forward” is as far into the future as the show will be going.