Marine expeditionary airfield systems technicians use a jackhammer to drive a steak into the ground as part of the M31 Marine Corps Expeditionary Arresting Gear System installation Sept. 6 at Tinian's West Field in preparation for Exercise Valiant Shield 2014. Arresting gear is used in order to land pilots in a short amount of space, or during an emergency. Valiant Shield is a biennial exercise which focuses on training that enables real-world proficiency in sustaining joint forces. The Marines are with Marine Wing Support Squadron 171 and MWSS-172, both under Marine Aircraft Group 12, 1st Marine Aircraft Wing, III Marine Expeditionary Force. (U.S. Marine Corps photo by Cpl. David A. Walters/Released)
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