F-15 is a general purpose fighter bomber. Typically used for combat air control, flying high above the battlefield with lots of fuel, bombs, rockets and sensors ready to help out where needed. F-16 is an interceptor. They sit on the airfields and when needed take off and quickly get where they are needed. The F-117 is a stealth ground attack aircraft. It operates where there is a radar threat that means the A-10 or AC-130 can not go into the area, not many were built. The F-22 and F-35 are more modern fighter jets which compromises between the F-15, F-16 and F-117 but with more expensive and modern technology. They are intended to do everything, both combat air patrol, interception and stealth. The goal is that older airplanes will be replaced with these newer ones. But they are a lot more expensive both to buy and operate. So it will take some time to replace the old aircraft. Typically you would wait until the natural end of the service life before replacing them with something new.
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