Mountain Home AFB and the 366th Wing have a rich history that stretches back more than 50 years to the United States' entry into World War II. Although the wing itself was not activated until after World War II, it shares the World War II heritage of the 366th Operations Group, whose precursor organization, the 366th Fighter Group, stood up about the same time the base was being built. In early 1991, the Air Force announced that the 366th would become the Air Force's premier "air intervention" composite wing.