U.S. Air Forces In Europe Insignia Patch (c. 1980s)
 
The first military patches were worn by British officers in the 19th century to denote officer rank. With the coming Industrial Revolution and cheaper access to fabrics and sewing machines, patches became a norm in many militaries. During World War I, military patches became commonplace for the United States Military. Many units sported unique patches related to where they came from in the states or their unit nicknames, and many of these original patches have become collector's items over time.
 
One Insignia Patch For Sale in Fair to Good Condition