Vintage U.S. Marine Corps (USMC) Officer Service Green Visor Cap (also known as a barracks cover). The distinctive embroidered silk design on the top crown is known as a quatrefoil, an ornamentation traditionally worn by Marine Corps officers since 1859. Made by Kassan-Stein, a high-end custom military tailoring firm located in Washington, D.C., active during the early-to-mid 20th century (prominently during WWII and the Korean War era).