F-15 was more about Vietnam and the F-4
Oh yeah.... Definitely. From the 50s to the 80s, they were able to get a lot of things funded with the specter of the big, bad bear in the east. The MiG-25 fighter was a great example of that. I think the USAF convinced congress that there was NO WAY we had anything in the sky that could do battle with the "Foxbat". It could go almost 3 times the speed of sound! My god, it could destroy our entire air force!
We *had* to have an interceptor that could match it. Say hello to the F-15 program, which produced one of the best air-air fighters ever made.
Then Viktor Belenko defected to Japan with a MiG-25, and it was inspected tip-to-tail before it was given back to the USSR. The air force's assessment?
It was big, and fast. If it had to slow down, turn, dogfight, or engage another aircraft, it would die. Quickly. Oh well, we got the F-15 program pushed through....
Despite common sells that it was an answer to the MIG-25, the F-15 was more about Vietnam and the F-4.
There might have been some rhetoric using the MIG-25 that justified the F-15 production, but the F-15 development started much earlier.
The F-4 was an outstanding, engineering achievement.
It massively exceeded the engineering requirements set by all military branches.
It is the epitome of engineering requirements defining and outstanding achievement for its time (late '50s/early '60s).
And it is also the epitome of how engineering requirements are
rarely the "end all, be all" of what the military needs.
The F-15 is a constant reminder to us engineers why pure engineering design on its own is useless, and input from more technicians and those who use the equipment is required.
It was an aircraft designed by pilots and mechanics for pilots and mechanics, a merger of technical and user need combined with engineering feasibility.
The F-4 was a chronic failure in the field -- both as an aircraft in the air and a support issue on the ground.
The F-4 was a flying brick took days to replace engines -- details that were at the forefront of the F-15's development.
The development and production of the F-15 actually saved operational costs, as much as readiness.
Hence why it's been adopted by many other nations, including both the Japanese and the South Koreans more recently, despite their own nation's development programs.
It was lessons learned on technical feasibility, supportability and a focus on things outside the concepts of pure engineering requirements and design.
Designed by pilots and mechanics for pilots mechanics.
And it set the standard for all, future designs.