Helmet Shield : The insignia plaque fastened on the front of a fire fighter's helmet that indicates the department name or initials, unit, rank, and, occasionally, serial number. See: Hat Front, Hat Shield.
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}