Watch: Royal Marines recruits tackle the infamous 30-miler
The final test standing between Royal Marine recruits and a green beret is the '30-miler'.
The eight-hour, 30-mile hike and run across the wild, open moorlands of Dartmoor is completed along with three other commando tests – the Endurance Course, a nine-mile Speed March and the Tarzan Assault Course.
Each test takes place after only 24 hours of rest and recovery.
Forces News joined the latest troop of recruits as they passed the final stage on the path to getting a green beret.
There's a support team of more than 20 military personnel, including medics, alongside the recruits as they attempt the final test.
For those who made it, there will be a formal passing out ceremony in the coming days at the Commando Training Centre at Lympstone in Devon.