Completion of the Air War College via in-residence, seminar or correspondence/CD-ROM formats, or in-residence completion of an equivalent senior level war college program of another service, or that of a senior level joint institution such as the National War College or the Dwight D. Eisenhower School for National Security and Resource Strategy, is considered a "de facto" requirement for all lieutenant colonels (O-5) in the U.S. Air Force, to include the Air Force Reserve and the Air National Guard, to promote to colonel (O-6) and to be competitive for future selection as a general officer.