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Just for completeness ... each Royal Air Force Officer swears the following oath ...
'I, Peter Crumpington Smythe, swear by Almighty God that I will be faithful and bear true allegiance to Her Majesty Queen Elizabeth the Second, Her Heirs and Successors, and that I will, as in duty bound, honestly and faithfully defend Her Majesty, Her Heirs and Successors, in Person, Crown and Dignity against all enemies, and will observe and obey all orders of Her Majesty, Her Heirs and Successors, and of the air officers and officers set over me. So help me God.'
British Navy and Army Officers do likewise ...