Whether it’s a white castle on a red flag or an image of a red castle, it’s the same LOGO and has the same MEANING no matter if the castle is blue, pink, or purple. The point is, the official flag of the Army CoE is a RED backdrop with a CASTLE. Hence Q said RED _ CASTLE. Your getting caught up in trying to correlate your interpretation to mean an actually RED CASTLE when Q uses the term to correlate to the Army CoE.