The items in this collection are all connected to the Knoxville Air Defense Filter Center. Including memos, magazines, an operation manual and a set of certificates belonging to Beatrice G. Smith, the collection contains material from the 1950s.

These papers document the military training and career of William G. Keen, an Army Air Force lieutenant who served in Europe during and after World War II. The collection includes several years of correspondence, training documents, professional photos, issues of many different magazines and newspapers from his various posts, as well as an assortment of memorabilia saved from service and travel.