Air Force Letter 200-5
On 29 April
1952, the
US Air Force Air Force Letter 200-5 (“
AFL 200-
5”) entitled “Unidentified Flying Objects Reporting” set forth UFO reporting procedures within the US Air Force, giving Project Blue Book authority to contact any Air Force unit in the USA without going through usual channels.
AFL 200-5 was later modified by the release of AFR 200-2 (26th August 1953).