Prince Harry Going on Grueling North Pole Expedition

Credit: Indigo/Getty

Just weeks before older brother William ties the knot to Kate Middleton, Prince Harry is set to accompany a team of wounded military servicemen on their unaided hike to the Geographic North Pole, where temperatures dip as low as -70 degrees, a rep for St. James Palace tells

PHOTOS: What Kate and William have been up to since their engagement

"The Prince -- Patron of the charity Walking with the Wounded -- will join the group at their base camp in in Longyearbyen, north Norway on March 29, where he will undertake three days of training with the team," the rep said in a statement. "The Prince will then trek with the team for five days as they commence their expedition high above the Arctic Circle."

On April 5 Harry, 26, who's serving as best man at William's April 29 wedding, will leave the team and head back to the U.K. to continue with his military training.

The Walking Wounded team, which includes four soldiers who suffered life-altering injuries, will continue on for another three weeks, says the rep. At the end of their mission, they will have covered 200 miles of frozen Arctic Ocean on foot pulling their own equipment.

For more on the Royal Wedding, including rare photos, interviews with family and friends, details on Kate's new life as a princess and a tour of their lavish homes, order a copy of Us Weekly's Will & Kate: The Royal Wedding now.