The military presence on British streets is being gradually stood down after being employed across the Bank Holiday weekend in the wake of last week's Manchester suicide bomb attack.
Servicemen and women had been sent to key sites, freeing up armed officers to enhance security elsewhere, as part of Operation Temperer.
The reduction of the UK terror threat level from critical to severe means they will be stood down.
The Metropolitan Police said the military support will be phased out over the next three days, while confirming the "extra police resources" used over the extended weekend have been stood down.
New CCTV of the Manchester bomber Salman Abedi has been released by police.
The younger brother of the Manchester bomber has said Salman Abedi was radicalised online in Britain.