Original U.S. WWI US Army Air Service Officer Collar Insignia Pair - US Made Military Flare Guns 441st Military Intelligence Detachment and

441st Military Intelligence Detachment and the 539th Engineer Detachment

It also has dome stamp E 4 5 on the top inside of the shell

Overall length is 10 inches

This soft leather bound album

Original U.S. WWI US Army Air Service Officer Collar Insignia Pair - US Made Military Flare Guns 441st Military Intelligence Detachment andOriginal Items: Only One Set Available. The United States Army Air Service (USAAS) (also known as the "Air Service", "U. S. Air Service" and before its legislative establishment in 1920, the "Air Service, United States Army") was the aerial warfare service component of the United States Army between 1918 and 1926 and a forerunner of the United States Air Force. It was established as an independent but temporary branch of the U. S. War Department