(delusion)In the early 1970s, the high cost of the F-14 and the instability of the TF-30 engine led to the adoption of the F-15 as the next fighter. In 1986, as the Air Force adopted the E model, the Navy also adopted the N model, N(E), based on the E model, which remained in service until 2006, after which it became the F/A-18E Then, it was replaced