An army base wedged in the mountains of Afghanistan is under attack. When a massive explosive hits the outpost, flying shrapnel severs Rifleman Tim Adams' artery. Lt. Grizzle charges into the fire toward his friend, while another soldier pinches the artery to save Adams' life. Then, on his first deployment in violence-ridden Karbala, Iraq, Sgt. Alex Reyes is thrown into his first firefight, encounters a suicide bomber, and provides backup on a dangerous raid.