The subculture of flying flags dates to come back centuries, serving as a way of communication on battlefields
https://alexisntsd860.lowescouponn.com/flying-the-thin-blue-line-a-tribute-to-law-enforcement-in-our-community
The culture of flying flags dates again centuries, serving as a method of conversation on battlefields. They conveyed messages of allegiance and victory, permitting armies to coordinate movements and processes with no verbal conversation.