Included in the plans, being outlined later Monday by Cameron to MPs in the House of Commons, will be the recruitment of 10,000 military personnel who will make up two new strike brigades, each 5,000 strong, for rapid deployment missions.
There will also be nine new Boeing P8 maritime patrol aircraft and an 18-billion-U.S.-dollar uplift in the equipment budget.
Downing Street said extra funding will be focused on investments that will help to ensure Britain can respond to diverse threats in an increasingly dangerous and uncertain world.
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