U.S. Marine Corps Col. Denise M. Mull, left, commanding officer of Combat Logistics Regiment (CLR) 25, and Sgt.Maj. Scott M. Schmitt, CLR 25 sergeant major., participate in 25-mile challenge at Camp Lejeune, N.C., February 21, 2019. Mull created the 25 mile hike challenge for the Marines and Sailors of the unit to challenge them both physically and mentally. (U.S. Marine Corps photo by Lance Cpl. Scott Jenkins) - U.S. Marine Corps Col. Denise M. Mull, left, commanding officer of Combat Logistics Regiment (CLR) 25, and Sgt.Maj. Scott M. Schmitt, CLR 25 sergeant major., participate in 25-mile challenge at Camp Lejeune, N.C., February 21, 2019. Mull created the 25 mile hike challenge for the Marines and Sailors of the unit to challenge them both physically and mentally. (U.S. Marine Corps photo by Lance Cpl. Scott Jenkins)