ARLINGTON, Va., May 16, 2006 — Paula Zwillinger knew something awful had happened when she saw two military officers waiting in her driveway as she came home from work on June 6, 2005. The officers told her that her son had been hit by a roadside bomb in Fallujah and had died 17 hours later. ..... ......Zwillinger would know nothing about her son's final hours until months later, when HBO called to tell her about an upcoming documentary called "Baghdad ER." It turns out that HBO was there in the Army hospital in Baghdad when Zwillinger's son, 21-year-old Lance Cpl....