U.S. Marine Corps Capt. Cameron Heard, left, and U.S.

U.S. Marine Corps Capt. Cameron Heard, left, and U.S. Marine Corps Staff Sgt. Michael Birch, right, Challenge Reconnaissance competitors representing U.S. Marine Corps Sgt. W. D. Wilson, hike between checkpoints during the inaugural Challenge Reconnaissance on Camp Pendleton, Calif., April 27, 2017. The event provided an opportunity for Marines of any military occupational specialty to honor fallen recon Marines. The event consists of 24 miles of hiking, helocasting, scout swimming, a memory challenge, obstacle course, close quarters tactics, live fire range and two pool stations. (U.S. Marine Corps photo by Cpl. Brandon Martinez)