The Internment is a good subject for discussion, as well as Confederate Battle streamers. But they are different subjects.
What US Army Units fought on CSA side? Did they not rename them?
According to the article, the example unit did NOT fight for the CSA, just some of the men-
Few units in the U.S. Army are as fabled as the Dundalk-based 1st Battalion, 175th Infantry Regiment (5th Maryland), better known simply as the 175th Infantry Regiment, of the Maryland Army National Guard…What’s little known today, however, is that many members of the unit split from the Union during the Civil War and took up arms for the South. Historians say most of its foot soldiers – largely working-class Baltimoreans who were, at best, suspicious of the intentions of President Abraham Lincoln – left for Virginia, where they reformed as the 1st Maryland Infantry Regiment (Confederate).
Enough of the outfit did so that the 175th gives their exploits a place of honor in unit history.
So the Unit did not fight at those battles, so why the battle streamers?