U.S. Marine Lance Cpl. Luis Mejia, a motor transportation

U.S. Marine Lance Cpl. Luis Mejia, a motor transportation operator with Combat Logistics Battalion 5, Combat Logistics Regiment 1, 1st Marine Logistics Group, posts security while participating in a convoy during Mountain Training Exercise 4-17 at Mountain Warfare Training Center, August 6, 2017. Marines participating in the Mountain Training Exercise post security to demonstrate protecting various areas against any possible simulated attack or ambush in the mountainous terrain. (U.S. Marine Corps photo by Lance Cpl. Timothy Shoemaker)