Grenades detonate down range after being thrown by Marines with 9th Communication Battalion, I Marine Expeditionary Force, aboard Marine Corps Base Camp Pendleton, Calif., Aug. 14, 2014. The communications Marines were trained by 1st Marine Division Schools as part of an annual training event to prepare them to react to various combat situations with confidence. 9th Comm. Bn. increases proficiency with grenades 140813-M-vz998-972

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Keywords: 9th, armed, comm., conflict, forces, military, states, united, usmc, war