I want to know the answer to the following question:
What are the QF-4 aircraft being replaced by the US Air Force?
All the background I'm provided with is that "The F-16 is currently used by the USAF Air Demonstration squadron, the Thunderbirds, while a small number of both man-rated and non-man-rated F-4 Phantom II are retained as QF-4 aircraft for use as Full Scale Aerial Targets (FSAT) or as part of the USAF Heritage Flight program.". Is that enough to answer the question?
Answer: no