LW - The problem is that it takes a long time to fix that stuff. There were 700 F-14s built and only 140 (new-build or retrofit) ever had the F110 engine. Out of 563 F-111s, 200 E/F versions were the only models deployed long-term overseas by TAC. The F-22 entered service with a huge wish-list of upgrades of which only a few will be done by 2020.