MARINE CORPS BASE CAMP PENDLETON, Calif. – Lance Cpl. Rivera, an infantryman with 15th Marine Expeditionary Unit’s Battalion Landing Team, studies grid coordinates while posting security during Certification Exercise, June 9, 2017. Maintaining tactical posture prevents enemy threats from gaining the upper hand over forces conducting operations. CERTEX is the last in a series of training exercises, which certifies the MEU capable for deployment in support of fleet and combatant commanders across the full range of military operations.

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