Carnac those are indeed interesting stats you posted. It clearly shows the late 50s/early 60s fascination with SPEED and more SPEED in everything related to jets.
It ties in nicely with GMRyujin’s true statement about the original F-4 having no internal gun. It was all about speed and missiles, and the “fastest” aircraft was the “best” aircraft.
Of course, it took actual combat experience and subsequent testing to prove that no one actually fought dogfights at high speed. A high top speed was useful for getting into the fight, but not actually fighting. It can also be used to run away, and the F-4 was uncatchable at low altitude (except by an F-111, and all he can do is glare at you).
With it’s design of a high top speed, the F-4 sacrificed lower-speed maneuvering. The thinking at the time was: high-speed dash into the fight, shoot a couple of missiles and go home. Of course, the missiles weren’t always accurate so the F-4 got into some close-in dogfights. Without a gun, it was helpless. I think it was a Navy guy who persuaded the leadership to let him mount a 20mm cannon externally on a few aircraft and see what happened. In a very short time the gun racked up more kills than the missiles.
The guns eventually became standard (internal) equipment on the F-4, and they were used when inside of missile range or when some poor guy was out of missiles.
The lessons of the F-4 were (thankfully) learned, and future fighters were designed with dogfighting maneuverability in mind. This is one reason why the F-16 and F-18 have lower top speeds than the Phantom II. Yeah, a high top speed is a sexy number but it contributes almost nothing to actually downing other airplanes.
And Chefguy and Declan have already commented on the smoke trails (NOT contrails). It was smoke from the exhaust, and once again something that technological progress has taken care of. For fighters it was to reduce detectibility, but for commercial airliners it’s been to reduce noise and pollution. Think about a 707 taking off vs a 777. Tons of smoke and noise vs almost none of either. Same thing with an F-4: tons of noise and smoke, even at cruise. An F-16 is still noisy on takeoff but leaves a smoke-free trail. You have eliminated one way for the enemy to spot you.
Obligatory link to a cool F-4 picture. It’s a Navy F-4 going transonic at VERY low altitude (the aircraft visible to the left is on the ground, as is the blue station wagon at the base of the shock wave. The F-4 is doing a high-speed pass down a runway.)