The Cateran Yomp, a 52-mile hike starting and finishing in Blairgowrie, Perthshire, will take place on June 14 and 15.
As an alternative to the gold 52-mile hike, people can raise money for serving and former soldiers and their families by walking 22 miles (bronze route) or 36.5 miles (silver). The trail leads yompers through Kirkmichael, Spittal of Glenshee and Kirkton of Glenisla, and entry to the event is £80 per person.
This includes costs for food, camping facilities, support and activities across the route. For those registering after February 28 the price is £99.
David Fox-Pitt, director of WildFox Events, added: "This year's Yomp is set to be our biggest yet."