The AF performs two accident boards on every Class A mishap; the first is the standard "safety" board, who's report is confidential. You will not gain access to that document.
The second investigation is what is commonly referred to as the "legal board," and again represents a formal determination of the cause of the accident. This report, generated by a separate board of investigators, can be used for administrative or legal actions against the crews as well. It is the only report that is released to the public.
Both boards use the same physical evidence, but the board chartered by the major command's JAG (again, the "legal" board) must perform its own interviews and may not see or hear any evidence gained by the safety board. Both boards work independently and may not even come up with the same conclusion as to the causality of the accident.
You can request the publically releasable accident report generated by the second investigative team. Contact the major command responsible for the aircraft in question. If the F-16 in question belonged to Air Combat Command, you'd address the request to the ACC/Judge Advocate General's office at Langley AFB, VA.
Best of luck.
