This article contains spoilers about season three of This Is Us. After two seasons of secrecy about the past of patriarch Jack Pearson (Milo Ventomiglia), This Is Us has opened the door into the elusive war hero’s background. The third season was marketed as a deeper foray into his experiences in the Vietnam War — and in the first third of that season, the show has already made good on that promise by revealing some very specific and shocking details.
TIME spoke to Stephen Maxner, the director of the Vietnam Center and Archive at Texas Tech University, to find out what the makers of This Is Us get right — and wrong — in their depiction of one of the most devastating and divisive wars in American history.
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