Defence Secretary Philip Hammond told ITV News it was not for him to judge whether Sgt Danny Nightingale should have been sent to prison.
He added that the Court of Appeal "acted swiftly" in this case which showed the system was "robust".
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It comes after the government announced international GCSEs, which many private schools use, would be dropped from the league tables.
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Dippy the Diplodocus is to forced into retirement and moved out of the Natural History Museum's main hall.