The Ministry of Defence has released an advert calling for volunteers to help fight terror groups in the latest edition of the British Army's official magazine.
It shows a woman at a bus stop reading a newspaper with the caption: "This woman has vital information. Do you have the skills to find out what it is?".
According to the 'Daily Express', the recruits are intended for the Defence Human Intelligence Unit (DHU) to conduct "special intelligence duties" on a mission dubbed "Operation Samson".
The unit, which works alongside the Special Air Service (SAS) and intelligence agencies, was set up to collate intelligence across Afghanistan when British troops were fighting the Taliban.
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However, with increasing fears of a major terror attack on British soil the unit is now being used to support the UK Home Office by gathering information across the UK, the newspaper claims.
The DHU is said to already have 400 troops and is reportedly commanded by a military officer who worked undercover in Northern Ireland.
A military source told the 'Daily Mirror', "They will be in plainclothes and their single task is to monitor and record events. Nobody will know who they are, they will deploy as couples, a man or woman on their own, they will just fade into the environment".
"Very little is known about the unit. They select across the armed forces and have a large number of Asian recruits working for them and did an outstanding job in Helmand.
"They operate special intelligence duties in support of the Home Office and MI5, but are not armed and their role is simply to collate information from a wide range of activities.