a moral code for United States service members who have been taken prisoner. It was created primarily in response to the breakdown of leadership and organization, specifically when U.S. forces were POWs during the Korean War. When a military member is taken prisoner, the Code of Conduct reminds them that the chain of command is still in effect (the highest ranking service member eligible for command, regardless of service branch, is in command), and requires them to support their leadership. The Code of Conduct also requires service members to resist giving information to the enemy (beyond identifying themselves, that is, "name, rank, serial number"), receiving special favours or parole, or otherwise providing their enemy captors aid and comfort. Since the Vietnam War, the official U.S. military term for enemy POWs is EPW (Enemy Prisoner of War). This name change was introduced in order to distinguish between enemy and U.S. captives. In 2000, the U.S. military replaced the designation "Prisoner of War" for captured American personnel with "Missing-Captured". A January 2008 directive states that the reasoning behind this is since "Prisoner of War" is the international legal recognized status for such people there is no need for any individual country to follow suit. This change remains relatively unknown even among experts in the field and "Prisoner of War" remains widely used in the Pentagon which has a "POW/Missing Personnel Office" and awards the Prisoner of War Medal. World War I During World War I, about eight million men surrendered and were held in POW camps until the war ended. All nations pledged to follow the Hague rules on fair treatment of prisoners of war, and in general the POWs had a much higher survival rate than their peers who were not captured. Individual surrenders were uncommon; usually a large unit surrendered all its men. At Tannenberg 92,000 Russians surrendered during the battle. When the besieged garrison of Kaunas surrendered in 1915, 20,000 Russians became prisoners. Over half the Russian losses were prisoners as a proportion of those captured, wounded or killed. About 3.3 million men became prisoners. The German Empire held 2.5 million prisoners; Russia held 2.9 million, and Britain and France held about 720,000, mostly gained in the period just before the Armistice in 1918. The US held 48,000. The most dangerous moment for POWs was the act of surrender, when helpless soldiers were sometimes killed or mistakenly shot down.