Ready to Fight Tonight

flags of U.S. and North Korea
For the U.S. troops living and working inside the Demilitarized Zone between North and South Korea, every day is spent living under the gun - literally. Within range of North Korea's artillery, the U.S. troops patrol each day with the knowledge that they could be asked to - and be ready to - fight that very night.

CBS News correspondent Barry Petersen spent some time with these guardians of the peace along the DMZ.