Contains correspondence, reports, clippings, photographs, and other materials related to Cooper's military service during the Second World War. Includes information on his work in China and with the Fifth Air Force. Materials date from 1917 to 1977.

Subseries contains Cooper's military personnel records, including orders, promotions, and certificates received during the course of his service. Materials date from 1917 to 1965.

Subseries includes photographs of Cooper and other members of the Kosciuszko Squadron, their equipment, and living areas; Polish Prime Minister Paderewski welcoming the squadron; the Cemetery at Lwow dedicated to the squadron; and ceremonies honoring Cooper in the 1960s. Montage celebrating Cooper's escape from Russia; and Polish World War II squadron named for the Kosciuszko Squadron.

Subseries contains photographs of Cooper and others from the China-Burma-India and Southwest Pacific theaters. Materials date from 1942 to approximately 1965.

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

Includes papers and ephemera relating to the creation and publication of Gail S. Halvorsen's autobiography, The Berlin Candy Bomber. Includes manuscripts and excerpts, cover paintings, and promotional material. Materials dated 1990-2010.