A soldier manning an Avenger missile defense system watches as a cargo ship travels down the Columbia River near historic Fort Stevens State Park. The historic old Army post located near Warrenton, Ore., constructed in the 19th century, is finding itself needed by 21st century warriors participating in a major U.S. Northern Command air defense exercise, Amalgam Dart 09, which began June 18. (U.S. Air Force photo by Al Eakle)