Assertion: stirrup | /r/CapableOf | become in april
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text: Promoted to air vice-marshal on 1 July 1997, he became Air Officer Commanding No. 1 Group in April 1997, Assistant Chief of the Air Staff in August 1998 and, having been promoted to air marshal on 6 November 2000, he was made Deputy Commander-in-Chief RAF Strike Command that year.