Cpl. Blake Arnold, forward observer, mortarman, 1st Battalion, 1st Marine Regiment, calculates the target coordinates during an individual training exercise at Range 410A aboard the Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., July 25, 2017. 1/1 is based out of Marine Corps Base Campy Pendleton, Calif., and is serving as part of the GCE during ITX 5-17.

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Keywords: air, america, archive, armed, army, defence, force, forces, military, navy, reportage, service, serviceman, servicemen, soldier, states, united, usa