The WWI US Army Reserve (USR) Officer collar insignia pin is a notable emblem of military service during the First World War. The pin typically features the distinctive USR insignia, which includes a detailed design of a crossed saber and torch, symbolizing leadership and readiness. Above this central motif, the badge may include the letters "USR" to denote the officer's affiliation with the United States Reserve forces. Crafted in brass or other metals, this pin was worn on the collar of the officer's uniform, representing their rank and role within the reserve. It reflects the commitment and distinguished service of WWI US Army Reserve officers