The military have had and continue to have a lasting impact on Dartmoor. On the North Moor, the three military ranges of (in area descending order) are: Okehampton, Merrivale and Willsworthy. This remote, high open moorland provides the perfect terrain and conditions for training and live firing. On certain days of the year the ranges are closed to the public on safety grounds, and a timetable for this can be found here and a map here. The ranges also form an integral part of the annual Ten Tors Challenge, where roughly 2400 teenagers aim to walk (at least) 35, 45 or 55-mile routes in teams of 6, all self sufficient, across two days, from Okehampton Camp. This lifetime endeavour is massively facilitated by the military. Okehampton and Merrivale Ranges are leased by the Duchy of Cornwall, the landowner, while Willsworthy is owned by the Ministry of Defence (MOD).

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