Correct, however I never said that was the amount trained per year which is the only data you've shown. I'm not arguing your math, you're just misrepresenting the problem.
That depends heavily on branch, in the Air Force one guy takes a tire off and another installs it. In the Navy the guy running Quality Assurance checks on your engine swapout might be the guy fueling your plane or launching you out. Same with the Marines.
It's true that the job of removal and installation is fairly dummy proof given you can read and follow instructions, but actually being able to lay out a schematic/circuit diagram and troubleshoot? Absolutely not lol get the fuck out of here.