jonathan metzger, the unit's leader and christopher patterson, just 20 years old. >> i happened to looke front door, and i saw the uniform. and, of course, i instantly -- i knew what it was. >> reporter: thursday night, christopher's body was returned to chicago. the patterson's saluted their son's flag-draped coffin. >> when chris was little, his favorite halloween costume was a christian soldier. he was one of god's soldiers and one of america's. >> reporter: he grew up in a military family and joined the national guard while studying music at indiana's valparaiso university. where he proudly sang in the school's a cappella group. his parents worry men and women serving overseas are starting to slip out of america's consciousness. >> we lost four out of one unit i think is why it's gotten so much press. >> we are out of iraq, but we're still at war and most people don't know that. we've been there for nine years now, and it's picking up. it's -- it's not over by any stretch of the imagination. >> reporter: the patterson's youngest son, carl, got leave from the marines to join the rest