Reservists in the British military could be called out on operations if there is a no-deal Brexit.
A new order has confirmed that the Ministry of Defence (MOD) can call upon reserves should Britain leave the European Union without a deal.
The move will enable commanding officers to send 'call out' notices to personnel if requested by government departments.
It is in support of contingency planning for a no-deal scenario, under the Reserve Forces Act 1996.
As many as 3,500 personnel could be called up, with around 10% of those being reservists.
However, the specific skill requirements would depend on which area of government was to make a request.
Any reservists who are mobilised for full-time service will be sent a 'call out' notice.
In most cases, personnel get 28 days' notice upon receiving a 'call out', however this may decrease in urgent situations.
The MOD has already confirmed planning is underway for if a no-deal Brexit takes place.
Defence minister Tobias Ellwood said on Monday it was 'right' for the MOD to contingency plan for a no-deal scenario.