Talk about a senior trip. Scott Erwin, a senior at the University of Richmond, is spending this academic year in one of the most dangerous places in the world - Baghdad - where bullets fly, trucks explode and heavily armed helicopter gunships skim the rooftops. It's a long way from the tall pines on the UR campus. In e-mail exchanges recently, the 21-year-old Erwin discussed what he's doing in Iraq and how he got there. Erwin, now a civilian employee of the U.S. Department of Defense, is a budget adviser for the Coalition Provisional Authority's Ministry of Interior. The authority...