The 178 Artillery 178A4(A/d, e) is an authentic WWII era Distinctive Unit Insignia from United States. This original military insignia features brass and enamel construction with a clutch back, electrostatically welded design. This piece was manufactured by Denmark's Military Equipment Corp. and bears authentic hallmarks: "D-22" over "DENMARK" over "N.Y. 10012" over "MADE IN" over "U.S.A.". Collectors often search for this type of item as a Distinctive Unit Insignia, also known as DUI, DI, Crest. This WWII period piece is highly sought after by military memorabilia enthusiasts and historians.
The 178th Artillery was constituted in the National Guard and has a lineage that traces back to earlier artillery units within the United States Army. Over its history, the unit has undergone several reorganizations and redesignations, reflecting changes in military structure and mission requirements. The 178th Artillery has served in various capacities, including as a field artillery unit, and has participated in both state and federal service, supporting domestic operations and overseas deployments as required. The unit's history is marked by its commitment to providing artillery support and its adaptability to evolving military needs.
Source: https://en.wikipedia.org/wiki/178th_Field_Artillery_Regiment