I found it interesting that Republican Congressman Devin Nunes addressed a Lieutenant Colonel as "Mr. Vindman" in the impeachment hearings today.

Even Fox News didn't support Nunes on this.

Some even questioned whether LTC Vindman should be wearing a uniform at a Congressional hearing. ABC News has a good explanation of that:

"A soldier performing duties in an official capacity will normally be in uniform," Col. Kathy Turner, an Army spokeswoman, said in a written statement. "In cases where a soldier is detailed to an agency outside of DOD, the individual would follow the policies of that agency."

-(former) Specialist 5 Joe Offer, whose uniform no longer fits-