The Combat Service ID Badge, or CSIB, is the Army Service Uniform’s equivalent of the full-color Shoulder Sleeve Insignia that was worn on the Class A/B Army Green Uniform, which is why the two insignias are almost always identical. (Full-color Shoulder Sleeve Insignias were reintroduced with the arrival of the Army Green Service Uniform in 2019.) A CSIB is worn on the right side of the Army Service Uniform (ASU), with males wearing it on the right breast pocket and females wearing it lower on the right side of the ASU coat, parallel to the waistline and positioned so that the top of the badge is roughly flush with the top of the third button from the top.
Only one CSIB may be worn at a time, and only two ID badges may be worn on each side of the ASU coat. Regulations do permit the wearer to move an ID badge normally worn on the right side to the left if it has lower precedence than the CSIB (Army Staff badge and below).
The Thunderbird on the 45th Infantry Brigade Combat Team CSIB was selected in 1939 to replace the unit’s original insignia of a red swastika. With the adoption of the new insignia, the Brigade—which actually was a division at the time—earned the Special Designation “Thunderbird.” “SEMPER ANTICUS,” Latin for “Always Forward,” is the unit motto and is found on the Distinctive Unit Insignia (unit crest).
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45th Infantry Brigade Combat Team Patch (SSI)
45th Infantry Brigade Combat Team Unit Crest (DUI)