[stametseater]

The F-15E and F-15EX (specifically these 'E' variants, aka "Strike Eagles") are multirole strike fighters. They're derived from an air superiority fighter and remain capable of filling that role, but being strike fighters they have a new emphasis on attacking ground targets with precision bombs. It is very similar to the way the F-14, the Navy's old air superiority fighter, was later turned into a strike fighter with the addition of LANTIRN (which the F-15E also got.) In addition to LANTIRN, the F-15E also gained a second seat for a weapon systems officer. Two seat F-15s had previously existed as trainers, but F-15s configured for air superiority normally have a single seat.

The F-22 is foremost an air superiority fighter and was intended to replace all the air superiority F-15s (but not the F-15E Strike Eagles.) However the USAF didn't get enough F-22s so they still have air superiority F-15s and will for some years to come.