By Hollie McKay, Fox News.com

LOS ANGELES – A U.S. military patrol unit slowly moves through a quiet Afghanistan village, when sudden enemy gunfire rings out and their convoy is ambushed by rocket-propelled grenades. The soldiers spring into action, confronted with an exploding IED and sniper fire from a house nearby. With two men down, fellow platoon members perform tactical combat casualty care as the firefight continues, transitioning to casualty evacuation as the wounded are rushed to the nearest hospital.

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