Combat Service Identification Badge

The Combat Service Identification Badge (CSIB) is a metallic heraldic device worn on the right side of the United States Army's Army Service Uniform that uniquely identifies a soldier's combat service with major U.S. Army formations. == Description == The Shoulder Sleeve Insignia-Former Wartime Service was also worn on the Army Green "Class A" Uniform, until that uniform was discontinued in 2015.

Source: Wikipedia — Combat Service Identification Badge (CC BY-SA 4.0)