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per wiki, f-15e was first produced in 1987, so there were very few in service at that time, and most of ground strikes were carried by other aircrafts.
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Yes, most ground strikes were by other aircraft types, but the F-15E did have a lot of sorties, almost as many as the F-111 or F-4G (although the F-16 had many, many more sorties, but not all of them were air-to-ground)

Source is the Gulf War Airpower Survey, page 184 (PDF page 205): https://apps.dtic.mil/sti/tr/pdf/ADA273996.pdf

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This one is also an F-15E it seems.
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