The Korean War was the first major armed clash between Free World and Communist forces, as the so-called Cold War turned hot. The half-century that now separates us from that conflict, however, has dimmed our collective memory. Many Korean War veterans have considered themselves forgotten, their place in history sandwiched between the sheer size of World War II and the fierce controversies of the Vietnam War. The recently built Korean War Veterans Memorial on the National Mall and the upcoming fiftieth anniversary commemorative events should now provide well-deserved recognition. The Korean War still has much to teach us: about military preparedness, about global strategy, about combined operations in a military alliance facing blatant aggression, and about the courage and perseverance of the individual soldier. The modern world still lives with the consequences of a divided Korea and with a militarily strong, economically weak, and unpredictable North Korea. The Korean War was waged on land, on sea, and in the air over and near the Korean peninsula. It lasted three years, the first of which was a seesaw struggle for control of the peninsula, followed by two years of positional warfare as a backdrop to extended cease-fire negotiations. The following is one of five accessible and readable studies designed to enhance understanding of the U.S. Army's role and achievements in the Korean conflict.