He's actually wondering if he should switch to Navy and go for nuclear technician now that he's seen his scores. Also I get the impression that they actually have to have job openings for what he picks as well.
Oh and his eyes are bad so don't say pilot, heh.
Go with whatever service offers the best enlistment package.
I joined the air force, but regretted not joining the navy.
I worked in a joint-service environment, but I was an e-3 and I worked with a bunch of e-4 and e-5s in the navy meaning they joined the same time as I did, but their job guaranteed them a promotion where they were making more money and got better benefits such as off-base housing.
I originally wanted to be a helicopter mechanic in the army, with the eventual goal of becoming a warrant officer and learning to fly helos. When I scored a 99th percentile on my asvab I was encouraged to take the DLAB and "do a harder career"
I was a 1N3 (1n332a) Spanish linguist. I absolutely hated the job, you don't have to be intelligent to be in intelligence. It's a lot of routine, boring work. It's the exact opposite of what you would think having a TSI/SCI clearance entails. It's not james bond. It's more "The Office" pushing paperwork about paper. The requirement to join the intel field is actually rather low, I think it was 40 when I enlisted. There are a LOT of REALLY smart people who do it... and then those same REALLY SMART people get out after 4 years because they were misled by people with good intentions that wanted the best for them, but thought intelligence careers required intelligence. Nope, it requires the type of person that can do the exact same task all day, every day. The type of environment that BURNS OUT anyone that would score a 99 on the asvab. And that's why, when I was in, 75% of first term enlisters got out after Their first term. (And why the navy was promoting people with 3 years of experience to E5)
I am now an air traffic controller with the FAA. I love my job MUCH more now, it's million times more social, and I actually get to use my brain (and the pay is good too, although 8 years of minimal/no pay raises has sucked, but that's every single government job). If he's wanting to work with his hands and do something meaningful, encourage him to continue his dream of becoming a mechanic, he will like it more than some boring computer job in the air force. There ARE believe it or not, a few 6 figure mechanics out there, and if he enjoys what he does and is ACTUALLY able to do anything he wants to, (which a 99 asvab suggests) he will find a way to be happy as a mechanic. There are a LOT of idiot mechanics out there, but only a few skilled ones, and the skilled ones are able to ask for a LOT of money for their specialized knowledge.
I wanted a job where I could get paid to think and solve problems, that's what mechanics do, that's what air traffic controllers do. It is NOT what intelligence in the military does.
Some jobs get paid for what they do, other jobs get paid for what you know. He should slowly work his way into getting paid for both. If money is a concern, don't let it be. A specialized mechanic (ie: aircraft engine mechanics) are NOT the same as Ted the flunkout who works at the muffler shop down the street or Bill the quick-lube guy who drains your transmission fluid instead of your engine oil because he's retarded. Don't make the same mistake that my parents made with their advice to me.