The Ministry of Defence has been accused of wasting almost £94 million a year by training teenagers for the army.
Colonel Bob Stewart, who served in Bosnia and is now an MP, told Daybreak "yes there's a cost for doing it" but that it was entirely beneficial. He said:
The vast majority absolutely love doing it and they go straight into the army and enjoy a great career.
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A police raid uncovered what is believed to be cocaine that had been stashed in nappies, and 40 cannabis plants.
The prince attended the rugby match in his role as patron of the Invictus Games Foundation, the official charity for this year's game.