His squad had come under heavy fire – and was likely to face it again. On June 22, 2012, Hospitalman Zackery Penner had risked life and limb to rush to care for a Marine shot during an patrol in Afghanistan with Bravo Company, 1st Battalion, 8th Marine Regiment. The Marine died due to the severity of his wound, a toll that hung heavy on the company. On June 23, the squad was helping Afghan soldiers clear a compound when they came under sniper fire. Two men were hit: a Marine and an Afghan soldier. Insurgent machine guns roared. What Penner…