Scope and Contents The Mark Doering Collection contains 142 slides taken by Doering while serving with the 509th Radio Research Unit in Vietnam during the Vietnam War. Slides predominantly show exterior views of military bases and soldiers, particularly Long Binh base. These slides include views of helicopters and planes, both in the air and on the ground. Slides also show city views, including street scenes in Saigon and distance views of Bien Hoa, as well as views of the countryside. Also included are...