Content Description The Lyden H. Rien Boeing Flying Fortress School Collection consists of materials related to Rien's military service during World War II as a B-17 mechanic. The bulk of the collection consists of U.S. Army Air Corps Technical School training materials from the Boeing Flying Fortress School, part of the Boeing School of Aeronautics, from when Rien trained as a B-17 mechanic in 1942. The materials include a two-volume training manual that is interspersed with handwritten notes and...