Anne S. K. Brown Military Collection, Brown University Library.
Calisphere: Images of World War I from California institutions.
Calisphere: Images of World War II from California institutions.
Calisphere: Images of the Vietnam War from California institutions.
Calisphere: Japanese-American Relocation Digital Archive.
Dazzle Camouflage: Online Exhibition at Rhode Island School of Design.
Europeana 1914-1918: "Untold stories & official histories of WWI." Resources from libraries, archives, and private collections across the world.
Fortified Places. Site about bastioned fortifications.
National Archives: Documents and Images related to individual American wars.
War Art in the National Archives (United Kingdom). Set on Wikimedia.
ALA's Library War Service Campaign. Photographs from the American Library Associations's campaign to provide reading material to World War I era soldiers. Includes many photos of army camp life.
William Emerson Strong Photograph Album: Portraits of 200 military officers and "notorious characters" of the Confederacy. Duke University site.
World Images: Choose pulldown menu in Portfolio Index for various collections under Warfare.