Speaking outside the court martial, Sergeant Danny Nightingale has apologised to taxpayers for footing his ongoing legal battles.
He said that his own part in covering legal bills had been "financially debilitating".
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The Government scheme would benefit those aged under 40 but will only run for five years.
Joseph Rowntree Charitable Trust and the Roddick Foundation are under investigation by the watchdog over grants made to Cage.
The Duke of Cambridge became a fearsome samurai warlord - at least temporarily - when he visited the set of a long-running Japanese drama.