Rylee McCollum, 20, was on his first deployment when he and 12 other U.S. troops were killed in a suicide bombing at the Kabul airport.
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McCollum was there helping U.S. forces and allies evacuate as the Taliban took back over the country.
McCollum's sister said he was looking forward to becoming a dad.
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"He was so excited to be a dad, and he was going to be a great dad," she said.
According to a Facebook post from a family member, McCollum's widow gave birth to Levi Rylee Rose McCollum on Monday at a naval hospital in California.