OD Green 2" Shooters Brim Jungle Hat Rip-Stop Made In USAVietnam OD Green 2" Short Brim Jungle Hat Rip Stop Made In USA Reproduction This is it, the most iconic hat ever to be produced in US Military history. The OD Green Jungle Hat. The concept of the "jungle Hat" had first originated during the 1940s with OD Green Daisy Mae hot weather sun caps issued to units in the Pacific and African theater of operations. The designed evolved over the decades to what we know today, issued throughout the Vietnam War.