In its annual report on the MoD's major equipment projects, the National Audit Office disclosed that delays to the £32 million Falcon communications system, which was developed for use in Afghanistan, meant it would not now be ready until after British troops have withdrawn in 2014.
Overall, it found that cost projected overruns for the 16 biggest programmes had increased by £468 million over the past year, while total delays have risen by 139 months.
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She told reporters: "I don't think it's fully sunk in how really bad that could have been, I know it's not the right decision."
Jonathan Theobald said: "The weather can change quickly and a car can become lethal, I've discovered that the hard way."
Political parties across the country suspended their General Election campaigns following the Manchester Arena terror attack on Monday.