When the rocket- propelled grenade exploded beneath the Humvee, Josh Olson had been crouched behind a tire for maybe 90 seconds, returning fire after his squad had been ambushed in the darkened streets of Tal Afar. He was 24, a sergeant in the U.S. Army's 1st Battalion, 187th Regiment, 101st Airborne Division. He’d enlisted upon his graduation from Freeman High School in 1997– he’d have joined at age 6 if he could – and served in Kosovo and Korea before being part of the initial invasion in Operation Iraqi Freedom. He was driven and disciplined – a professional soldier, instinctive leader, immediate friend.