OP
Official max chat on a F-4 at less than 200 ft 902 MPH, Operation Sageburner by a USN YF4H-1 in 1961.
Official FAI World Record at low altitude is 988.26 MPH by a civilian owned and highly modified F-104 in 1976, though the FAI have disbanded the class of record for turbojets since then. The F-104 in question did do an earlier record attempt where it is reckoned that it reached 1010 MPH, but the timing equipment failed so the record didn't stand.