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Reserve military officers could be called up for a year of service as part of government plans for a no-deal Brexit.
It comes after the defence secretary said 3,500 troops were "held at readiness" to help if the UK crashes out of the EU.
Order - Statement - Thursday
The official call-up order was made in a ministerial statement on Thursday.
Labour, which is calling for a no-deal to be ruled out, said the move showed the prospect was a "serious threat".
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Reservists, who have military training but also hold civilian jobs, will make up one in ten of the troops prepared to be deployed before the scheduled Brexit date of 29 March.
Reserve - Forces - Act - Defence - Secretary
Under the Reserve Forces Act, Defence Secretary Gavin Williamson can call on the officers to be sent "anywhere in the world" if it is "necessary or desirable".
The act says this can be done "for the alleviation of distress or the preservation of life or property in time of disaster or apprehended disaster".
Order - Effect - February
The order will come into effect on 10 February and last until...
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