Strategic Defence and Security Review 2010

The Strategic Defence and Security Review 2010 was announced by the newly formed Conservative-Liberal Democrat coalition government of the United Kingdom in May 2010, and published on 19 October 2010. The previous major review of UK defence strategy was the Strategic Defence Review, published in 1998, and updated in 2003 by the Delivering Security in a Changing World white paper.

As well as wanting an updated security policy, both the Conservatives and Liberal Democrats wanted the £38 billion overspend in the Ministry of Defence (MoD) procurement budget addressed. With the government committed to reducing the national budget deficit, the Treasury asked the MoD to draw up options for a 10–20% real-terms cut in its budget. However, the final amount was a 7.7% reduction over four years.

All three of Britain's armed forces would take cuts in manpower. Overall, the largest overseas deployment was expected to be not more than 30,000 personnel, including maritime and air force units. This compares to the 45,000 involved in the 2003 invasion of Iraq. In November 2010, the MoD released its plan to implement the changes.

The SDSR called for the almost immediate decommissioning of the Royal Navy flagship aircraft carrier, HMS Ark Royal, rather than in 2016 as scheduled. This occurred on 11 March 2011.

The Report also announced the early retirement of the Joint Force Harrier aircraft, the Harrier GR7/GR9. Both of these measures were to save money for the purchase of the Queen Elizabeth class aircraft carriers. The Harrier fleet made its last operational flights in December 2010. 72 British Harriers were sold to the United States in 2011 to be used for spares.

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