4620th Air Defense Wing

The 4620th Air Defense Wing is a discontinued wing of the United States Air Force. Its last assignment was with Air Defense Command (ADC) at Santa Monica, California, where it was discontinued in 1961. The wing was organized in 1955 to ensure that the Semi-Automatic Ground Environment (SAGE) air defense system, was compatible with ADC's operational requirements. It also performed operational testing and training on SAGE and earlier systems. Once SAGE started to become operational, the need for the wing no longer existed and it was discontinued, although one of its subordinate groups continued the SAGE training mission until 1962.