Since 2009, the remote wilds of Exmoor in South West England have become part of a special annual event, accountable for blistered feet, tortured muscles and laboured breath - the Exmoor 30:30.
Staffed by volunteers, the purpose is to raise money for the Royal British Legion providing help and welfare to the serving and ex-Service community and their families.
Teams of participants come from all walks of life: servicemen and civilians, locals who live on the moor and first time visitors, with some even from Europe.
The event is run by a group of former soldiers who remain taciturn about their contribution and involvement.
In one of the toughest endurance events in the UK, 30 pounds of weight is required to be carried per person over 30 miles, or for some, a gentler 30
kilometres.