No they are not the same,
They vary from branch to branch and the USMC training program is the best out of all of them.
He had more than enough skill.
The target was moving very slowly and yes away from him which only limited the amount of time he had. Limited but not unreasonably so. The target was very close which eliminates the downward problem,
The Oak tree did not obscure the target during the actual shooting which is all that matters,
I debunk the CT people you help them.
HE had the skill that is proven fact you had to backpedal on it and try to marginalize the facts proving he did in fact have the skill.
The Corps definitely has the best training, but the scores needed to qualify are the same from service to service. You're simply wrong. Hell ROTC has the same qualifications. I shoot with a man who won the Walsh Trophy (USMC Individual Pistol) TWICE in a row which no one has done before or since, so actively know real USMC Presidents 100 shooters, you don't. I actively shoot every week to maintain my skills, oswald didn't. He was a marginal shot, and his ability to manipulate the bolt on the Carcano in a timely fashion is questionable.
The target was 90 yards away, in a poor quality scope, with crap mounts, that is a hard shot. You see, the closer you are, the HARDER it becomes to hit when you are using a scope. Especially a scope that hinders the ability to manipulate the bolt of the rifle you're firing.
And no, you are not debunking them. You are tossing out long tired tropes that confuse people who don't know anything, but your rifle knowledge is a joke. The Carcano isn't a bad rifle as the CT people claim, but nor is it a great rifle as you would have everyone believe. Shooting a moving target that is below you, and that you are trying to pick up in a poorly mounted scope is not anywhere near as easy as you would like to make it out to be.