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- JD Vance, 39, would likely be the first Marine veteran to serve as vice president if elected.
- Donald Trump announced Vance, once a critic of the former president, as his running mate on Monday.
- In a sense, Vance's service "is a balance" against Trump's Vietnam draft deferments, an expert said.
Republican presidential nominee Donald Trump on Monday selected Ohio Sen. JD Vance — a Marine veteran, author, and once-critic of the former president — as his running mate for the 2024 election.