The "Rainbow Division" is the nickname for the 42nd Infantry Division of the United States Army. It earned this name during World War I because it was made up of soldiers from various states, symbolizing a rainbow of diversity. The division played a significant role in several key battles, including the Meuse-Argonne Offensive. In addition to its World War I service, the Rainbow Division has a storied history in World War II and beyond. It has been involved in various conflicts, including the Korean War and Operation Iraqi Freedom. The division is known for its distinctive patch featuring a rainbow, representing unity and strength.