This collar insignia was worn during WWI. It has a pin back and is bronze- and silver-colored metal.
First Lieutenant Edward H. Miller was a pilot assigned to the Aviation Section of the Army Signal Corps in WWI. He also attended the School of Military Aeronautics at the Massachusetts Institute of Technology, Massachusetts. The tunic design is similar to the British uniform in WWI. The wool tunic has a high collar, plastic buttons, silver bullion wire pilot wings, and three service chevrons.