A US Army spokesperson tells CNN that “a Soldier performing duties in an official capacity will normally be in uniform.”
“In cases where a Soldier is detailed to an agency outside of DoD, the individual would follow the policies of that agency," Col. Kathy Turner, Army spokesperson said.
It is not unusual for military officials detailed to the NSC to wear civilian attire while working in White House and wear their uniforms while appearing before congressional hearings.
For example, Oliver North appeared in uniform during the Iran-Contra hearings in the 1980s.
Several Republican members have sought to question Lt. Col. Vindman’s stature inside the White House, seeking to portray him as a disgruntled underling who inflated his own importance.
Rep. Chris Stewart of Utah even went as far to point out that Vindman was wearing a military uniform to his hearing, even though he normally wears a suit to his job at the White House. And he asked why Vindman clarified his rank during earlier questioning with Rep. Devin Nunes.
“I’m in uniform wearing my military rank. I thought it was appropriate to stick with that. The attacks that I’ve had in the press and Twitter have marginalized me as a military officer,” he said.