The Confederate combat flag, repeatedly recognised by its special blue saltire against a red subject

https://griffinxggr953.juniperbrief.com/posts/reenactment-realism-how-civil-war-flags-bring-history-to-life

The Confederate war flag, characteristically recognized by its wonderful blue saltire in opposition to a crimson discipline, become a lasting image of Southern pride and history, notwithstanding its debatable connotations.