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Marine Corps 2nd Lt. Aaron Walker, an infantry officer with 2nd Battalion, 6th Marine Regiment, shoots an M4 during a live-fire training exercise while a part of a security element and enabler course aboard Stone Bay, Marine Corps Base Camp Lejeune, , July 14, 2021. SEEC trains Marines and sailors in several combat-oriented skills that support the assault element of the 22nd Marine Expeditionary Unit during deployments.
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