Air Ministry Orders (issued 1918-1964), were printed routine directives to units for information, guidance and actions. From 1918-1930 they were issued weekly, and thence split into four series: A (Administrative or Standing Orders); N (Temporary Orders); E (Equipment Orders) and B (discontinued 1943), which complemented the Air Ministry Confidential Orders. With the creation of the Ministry of Defence the Orders were replaced by Defence Council Instructions (RAF).
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