3rd Battalion, 9th Marines

The 3rd Battalion, 9th Marines (3/9) is an infantry battalion of the United States Marine Corps, first activated in 1917. The battalion saw extensive combat in World War II, notably participating in the battles of Bougainville, Guam, and Iwo Jima. During the Vietnam War, 3/9 operated in key engagements such as Operation Dewey Canyon and the Battle of Khe Sanh. The unit has since participated in multiple deployments, including the Gulf War and the Global War on Terror, before being deactivated and reactivated several times in the 21st century.