Hit drama "This Is Us" is known for bouncing around between the past and the present, and its upcoming third season will be no different: According to the actor who plays the dearly departed Jack Pearson, the patriarch's story is far from over.

In an interview with People, Milo Ventimiglia gave fans a preview of what they can expect from the new season, which starts shooting this summer. As was teased in bits and pieces throughout the recently-wrapped second season of the series, there's a lot more to the story of Jack's time serving in the Vietnam War, and now, "This Is Us" is ready to reveal additional information about that mysterious period in the protagonist's life.

"We're definitely going to see Jack in the Vietnam era," Ventimiglia explained to People. "At the end of the Super Bowl episode when people were ultimately confronted with how he passed away, there was a trailer to show Jack in a helicopter over Vietnam in uniform. We're going to explore that side of Jack's 20s and what brought him into the man that we all knew."

Based on the few clues that were sprinkled throughout season two, we know that much of Jack's experience in Vietnam was tied to his younger brother, Nicky, a character that fans didn't even know existed (and the rest of the Pearson clan doesn't know about yet, either). It's assumed that Nicky didn't survive, and we're guessing that Jack's guilt over that -- and what exactly happened -- will be a big part of episodes to come.

We already know that Kevin is planning on traveling to Vietnam to find out more about his father's service, based on the flash-forward that took place at the end of the season two finale. We're eager to see how the past and present storylines collide.

"This Is Us" begins shooting season three in July. No premiere date is set yet, but it should debut sometime this fall on NBC.

[via: People]