Luca Sbisa lay flat, stomach and hips glued to the ground, taking the prone position with his left leg extended and right knee bent.

His weight was on his elbows, nerves on edge. His left hand reached forward, steadying the M4 service rifle and bracing the 30-inch-long, 7-pound carbine weapon against the pocket of his right shoulder.

His right cheekbone was snug against the gunmetal of the rifle stock. His right eye focused hard, peering through the 4x32 scope rifle combat optic at his three-ring target on the berm 200 yards away.

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