The back of this vintage photograph bears a handwritten note identifying the subject as a 'Workhorse Caribou A/C' and a 'CH-47' — references to the de Havilland C-7A Caribou and Boeing CH-47 Chinook, two aircraft central to U.S. airlift and troop mobility during the Vietnam War. Such personal annotations, penned by the photographer decades ago, offer historians direct, first-hand identification of wartime imagery. Project: 218683