Air Force Dress Belts - Blue Cotton With Mirror Finish Buckle SBBA~Pair~11108DBR~11108DBR|2 Army Branch Insignia letters are

Army Branch Insignia letters are worn in tandem with branch insignia badges

United States Army Ordnance Branch Insignia

The CIB and the Expert Infantry Badge were created primarily as a means of recognizing the sacrifices of the infantrymen who were disproportionately likely to be killed or wounded during World War II

this device on the blue infantry disc was listed as the equivalent of the roundel that appeared on headgear of many European armies

This would work similarly for the Senior or Master versions

Air Force Dress Belts - Blue Cotton With Mirror Finish Buckle SBBA~Pair~11108DBR~11108DBR|2 Army Branch Insignia letters areUnited States Air Force Dress Belt Blue Cotton With Mirror Finish Buckle Criteria: Worn on the Air Force Service Uniform, this Dress Belt is manufactured with high quality blue cotton and fastened with a mirror finish buckle. The belt is available in two styles: Male (44 inches) and Female (39 inches).