What happened in Vietnam?
That was addressed on This Is Us Season 3 Episode 4 when Jack Pearson wrestled with a surprising decision that involved Rebecca.
Determined to choose love over war, he might have made a decision that could land him in jail.
Meanwhile, Rebecca wrestled with the ramifications of a decision of her own, making her wonder whether there really was a future for her and Jack.
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Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.