 On the east coast, the AWS was under the auspices of the Army Air Force's 1st Interceptor Command (later First Fighter Command or I Fighter Command) based at Mitchel Field, New York.On the west coast, the AWS was under the auspices of the 4th Interceptor Command (later Fourth Fighter Command or IV Fighter Command) based in Riverside, California.On both coasts, observation posts, information centers and filter centers were established.