Air Force Records
Search the National Archives Catalog for Air Force Records
Search Air Force Records in the Access to Archival Databases (AAD)
Unidentified Flying Objects - Project BLUE BOOK
Air Force links provided by the Archives Library Information Center (ALIC)
Research in Military Records at the National Archives
These are two versions of the same filing manual. Please note that Chapter 3 discusses "The Air Force System for the Arrangement of Records by Subject" with "File Codes" discussed in paragraph 15e. Appendix A gives the "Air Force Subjective Classification System".