Yep, its a AIM-7M (I don't think the F-15E was ever cleared to carry AGM-88 HARM, USAF Weasel types with that weapon were the F-4G and F-16C(J)). I have seen both weapons in drill form fitted to the aircraft when it was first displayed at Mildenhall's Air Fate in 1993. The AIM-7 didn't go out of service with the US Armed Forces as an air launched weapon until not long ago (The F-14 was never modified to carry the AIM-120, so it needed something with BVR smaller than the AIM-54, i.e. Sparrow).