 It was found that the F-104A was not very well-suited for service as an interceptor.ADC released all its F-104s to the Air National Guard in 1960 because its fire control system was not sophisticated enough to operating in conjunction with the Semi-Automatic Ground Environment system to make it an all-weather interceptor.Service with the F-104s was consequently quite brief, and the Starfighters were replaced by the more heavily armed all-weather McDonnell F-101B Voodoo in July 1960.