1st Lt. T Markoff, left, assistant operations officer, Marine Wing Support Squadron-372, 3rd Marine Aircraft Wing, and Sgt. Maj. Timothy Riggs, sergeant major MWSS-372, 3rd MAW, kneel in front of a battlefield cross during the 10th Annual Challenge Recon on Marine Corps Base Camp Pendleton, Calif., May 17, 2018. Challenge Recon hosted a total of 16 two-man teams. Each team throughout the event carried a set of dog tags around their neck and an air panel, tied to their packs with the stenciled name of a fallen Marine.

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