Badges

Detachable badges in metal or cloth are a key element of military uniforms.  They were worn on a caps, or collars, shoulders, arms, or cuffs.  They identified the rank of the serviceman, their particular regiment or ship, qualification or specialist trade, and distinguish those with gallantry awards, long service or who have been previously wounded. Servicemen also wore badges of larger formations (such as Brigades, Divisions or Armies), within which their unit is currently serving.
In my collection, I currently possess a cap badge from the Devonshire Regiment. Sometimes I enjoy wearing it too.