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An Operational Requirement, commonly abbreviated OR, was a United Kingdom (UK) Air Ministry document setting out the required characteristics for a future (i.e., as-yet unbuilt) military aircraft or weapon system.
In conjunction with any official specification, prospective manufacturers would then choose whether to design an aircraft or weapon for this particular requirement.
Operational Requirements were carried over with the dissolution of the Air Ministry and the creation of the Ministry of Defence (MoD).
- Moore, Richard (2010). Nuclear Illusion, Nuclear Reality: Britain, the United States, and Nuclear Weapons, 1958-64. Nuclear Weapons and International Security since 1945. Basingstoke, Hampshire: Palgrave Macmillan. pp. 81–82. ISBN 978-0230-21775-1. OCLC 705646392.
"A study of the political, military and technical aspects of Britains nuclear weapons programme under the Macmillan government, contrasting Britains perceived political decline with its growth in technological mastery and military nuclear capability. Important reading for anyone interested in the history and military technology of the cold war" – Publisher
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