Under the law, Trump names four members while the House and Senate Armed Services Committee name two each.
Thirty-seven service members were killed in aircraft crashes in 2017, nearly double the number from the previous year.
Hagin, who has served under four Republican presidents, left Trump’s White House this summer. Hagin, 62, had pledged to work at the White House for one year, but eventually stayed for 18 months before announcing his departure.
Hagin and Portman have been friends since growing up together in Cincinnati. Hagin attended Cincinnati Country Day School and Kenyon College.
In addition to Trump, Hagin worked on the White House staff for Republican presidents Ronald Reagan, George H.W. Bush and George W. Bush.
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