USMC OD Green Cover Rip-Stop 2 Ply No Top Stitch W/ EGA Made In USAUSMC OD Green Cover Rip Stop 2 Ply No Top Stitch W EGA Made In USA This is it, the most iconic hat ever to be produced in US Military history. The USMC OD Green Cover. The concept of the "Cover" had first originated during the 1940s with OD Green herringbone twill HBT cover issued to USMC units in the Pacific theater of operations. The designed evolved over the decades to what we know today. The design gets the nickname from collectors & veterans