Using historical files kept by each of the armed services and nations involved in the Korean War, Rottman provides information on unit backgrounds, organization, manning, periods of service, insignia, weapons, casualties, and major commands including the Western, North Korean, Communist Chinese, and USSR forces. The United Nation's first military action and America's first major Cold War action, the Korean War, frequently called the forgotten war, is well documented in studies and reports of specific actions and phases of the war. These sources, however, provide little order of battle information on most of the belligerents, particularly the non-U.S./UN and South Korean forces. Using the historical files kept by each armed service and each nation, Gordon Rottman provides information on combat units and major commands, including both Western forces and North Korean, Communist Chinese, and USSR forces. He has done an invaluable service for scholars and military buffs. Filling a void that would not likely have been filled otherwise, the book provides information on unit backgrounds, organization, manning, periods of service, insignia, weapons, and casualties. The book will be a primary source for anyone, scholar or layman, interested in researching the Korean War.