[We are just buying some to replace old F-15C’s that break in half]
A few years back a Missouri ANG F-15C literally snapped in half while in the air. So while that kind of catastrophic failure is rare, it does suggest that the high-time air frames are done for.
Observed events. The AF took about 500 f-15’s out of service.
http://www.aero-news.net/index.cfm?do=main.textpost&id=169da539-caa1-4167-a5c3-425a61341c29