Contains correspondence, documents, publications, photographs, and memorabilia covering all aspects of Cooper's military career, including the Mexican border campaign, World War I, the American Relief Administration, the Russo-Polish War, World War II, post-retirement, and Cooper's own research materials on the Japanese attack on Pearl Harbor. Materials date from 1911 to 1977.

Contains correspondence, certificates, and photographs related to Cooper's work with the American Relief Administration. Materials date from 1919 to 1920.

Contains correspondence, newspaper clippings, and photographs documenting Cooper's service during the Mexican border campaign from 1916 to 1917. Includes snapshots of Cooper and panoramic shot of Company B of the 2nd Georgia Infantry on Mexican Border Service at Socorra, Texas, in January 1917.

Contains correspondence, photographs, research, and other materials related to Cooper's post-retirement activities associated with the military. Materials date from 1911 to 1977.

Copy prints and negatives of Ford Island and military ships, includng the U.S.S. Arizona, before the attack on Pearl Harbor, and copy prints of the base after it was attacked. Dated January to December 1941. Collected by Dennis P. Svedin.