Timothy N. Castle served two tours in Southeast Asia during the Vietnam War, flying over Laos from Nakhon Phanom Air Force Base on thirty-eight combat support missions. Since 1990, he has traveled to Laos frequently as a researcher and senior Department of Defense POW/MIA investigator for Laos, and as a consultant for NBC News. He is an Associate Professor of National Security Studies at Air University, teaching courses at the Air War and Command and Staff Colleges at Maxwell Air Force Base in Alabama. He is also the author of "At War in the Shadow of Vietnam" (Columbia).