The product is a Vietnam era US Army 28th Infantry Regiment DI/DUI clutch back pin, which is an original period item from the era of the Vietnam War. This military collectible reflects the history and significance of the 28th Infantry Regiment during the conflict, making it a valuable piece for collectors interested in militaria and Vietnam memorabilia. The pin showcases a sense of pride and nostalgia for those who served in the Army during this tumultuous period in US history.