A working topographic map used to coordinate the search for the downed aircrew known by the radio call sign "Boxer 22," lost over the mountainous jungle terrain of eastern Laos along the Ho Chi Minh Trail during the Vietnam War. Combat search-and-rescue missions in this heavily defended border region relied on close coordination between forward air controllers, A-1 Skyraider "Sandy" escort pilots, and Jolly Green Giant helicopter crews. Project: 218834