For Death over Life...
The USAF is the most laid back, really. But like all branches of the military: IT IS A CULT.
If you want room+board (after BMTS, it's private or semi-private rooms, and the food IS good), and a regular, relatively secure job (with training), and be able to drive off the base pretty much any time, USAF, all the way. Most of the nasty things I am about to also reveal are present in all branches of the service.
In the USAF, you won't be trapped on a ship, or (usually) confined to a base with 50 of your 'closest friends' all the time.
90+% of the time, you can ESCAPE. Most USAF bases have PARKING. You know, so you can own a POV (privately owned vehicle). Once you're out of BMTS and tech school, and on a permanent duty base, get a car, or have someone bring your car to you, if you already had one. You'll be on a long leash. Officers in the Marine corps get treated A LOT worse than enlisted guys in the USAF.
I was enlisted aircrew. But this was the late 1980s. So I won the cold war 'n stuff fer you snot-nosed brats! I can say that 'cuz Dubya's daddy said he won the cold war. My experience is certainly outdated.
The travel was so-so. Basically, I got to see hotel rooms and flight lines all around the world... and not very much else. Though I got to go to Saudi Arabia (summer) and Iceland (winter) lots of times, I didn't get to do much of a 'tourist' nature. Of course, I lied about 'religion' on the paperwork in Saudi Arabia, or they'd have sent me back, and I'd have missed out on my pork + coca cola fasting, and I'd have been in the shit when I did get back for NOT lying.
There was some intermittent religious pressure, but it was easily shaken off without having to get 'impolite'.
The only real downside to being aircrew was the additional visibility and stress. They REALLY want shiny, pretty people. I'd have probably stayed in the USAF if I had gotten a 'real job', but I got burned out on THAT aspect. Your milage may vary, naturally.
A little bit of military jargon: 'Policing' is picking up trash. Literally walk across acres of mowed grass (and you WILL mow) and/or concrete, looking for bits of paper or other debris to pick up and put in a bag. All branches of service have this tradition. A 'FOD Walk' is doing that on an air strip. Being enlisted, you'll do both, just as I did, and lots of silly details (chores) and maybe 'additional duties', too. It's just part of the job.
Everything in the military is about who put their time in. Seniority is everything. It's practically all some people have, and they latch onto it. Officers get saluted. Talking back is a federal crime. A little bit of hazing is universal. Individual assholes and collective punishment. You will experience it.
If it's around 1700 (5:00pm), and everybody starts running for doors, and you hear some faint music, stop and salute the flag. That's 'retreat'. Some people get VERY annoyed about it if you don't notice. You could probably have your phone vibrate at 1645 to let you know to get indoors if this will be a bother.
95% of the jobs in the USAF have nothing to do with riding in an airplane, except maybe when travelling, which is relatively rare by the time your training is all done.
Just choose your job preferences carefully. The USAF may ignore your preferences... but they'll stick you in that pigeon hole, if it's available. The thing that can be FAR worse than not getting what you ask for... is getting PRECISELY what you 'ask' for, not knowing what it is. Do your homework about the jobs and the kind of training you get for them. You don't want to be looking at that form and looking up the little one paragraph descriptions for those jobs.
Hint: 'Crew Chief' is a sucker job. You are NOT 'in charge' of anything. You will be soaked in nasty chemicals day in, day out, on the hideously loud and somewhat dangerous, and almost always either freezing or roasting flight line at all hours, working on airplanes, but you get ABSOLUTELY NO FAA CERTIFICATION for that. The unions are strong. Even if you worked on Boeing planes for which there are identical civilian models, you would have to take your training over again FROM SCRATCH to work on a civilian airport. But at least the GI bill will kick in for a PORTION of that redundant schooling.
With flightline jobs, you'll be treated like shit, because you are 'shit', especially if you're a noob. No rank, no seniority. Shit rolls downhill, and you're at the bottom, catching it all. Try to stay away from the aircraft maintenance jobs that put you out ON the flight line. IN ALL WEATHER. The jobs are almost all pure, sweaty gruntwork. You unbolt big, heavy, dirty, broken things, jack them down, and send it to OTHER people to be fixed, then get the replacement and do it in reverse, and (maybe) test it. Like being a car mechanic, except with hearing damage and LOTS of abusive bosses, and OMFG if you can't account for that last washer, you are SO fucked!
If you deploy, you NEVER get a break.
This I got from getting to know people who work on the airplanes.
Stay the fuck away from those flightline jobs. Hard, honest work, and LOTS of it, and relatively little applicability to getting a job in the 'real world' when you get out.