The figure of 90 U.S. deaths comes from Dr. Conrad Crane, director of the U.S. Army's Military History Institute. A total of roughly 400 South Korean and 900 North Korean soldiers have also died in this 54-year history of sporadic clashes—or an average of 30 per year on all sides of the conflict, far fewer than the daily toll in Iraq, and, in the case of Korea, all the killing has taken place well away from civilian populations.