In the heat of an ambush in Afghanistan's most lawless province, a 19-year-old Nebraskan jumped in front of a grenade to shield other Marines in his platoon. Richard Weinmaster was critically wounded by the blast. But the bloodied Cozad native stayed in the fight, firing his machine gun at the enemy position until he collapsed from his wounds. Looking back at the July 8, 2008, engagement, Weinmaster says he was “just doing my job.'' But his bosses in the Marine Corps — and the Secretary of the Navy — felt otherwise. Advertising On Thursday, they awarded the now 20-year-old Weinmaster...