original_query: What was the purpose of the exchange of the F-4C for F-4Es in early 1978?
query: What was the purpose of the exchange of the F-4C for F-4Es in early 1978 for the 57th Fighter-Interceptor Squadron?
answer: The F-4E models were better equipped than the F-4Cs, featuring solid state radios, tactical navigation equipment, a lead computing optical gunsight, and ILS.