Yet another defence review. Why not read the others?

Four years ago, serious engineering maintenance problems were exposed when half a billion dollars worth of maritime defence capability was retired early.

One of the navy's key supply ships, HMAS Kanimbla, lost power entering Sydney Harbour and narrowly missed coming aground. The Kanimbla and its sister ship, HMAS Manoora, were decommissioned.

This failure led to a review (the Rizzo review) that exposed the high level of risk caused by the loss of engineering capability in government agencies. It was hardly the first defence review to identify the risk, nor was it the last.

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