Operation Oregon An infantryman is lowered into a tunnel by his fellow soldiers during Operation Oregon, a search-and-destroy mission conducted by an infantry platoon of Troop B, 1st Reconnaissance Squadron, 9th Cavalry, 1st Cavalry Division (Airmobile), in the Quang Ngai Province of Vietnam, April 24, 1967. SHARE: Download: Full Size (0.3 MB) Credit: Army/National Archives VIRIN: 670424-A-D0439-021.JPG Photo Gallery