That's MONEY right there....take that to the bank....
12 years USMC here....still thinking about going back....
Anyhows....whatever you want/discuss/decide/etc with the recruiter, its in WRITING on the contract. Otherwise, its BS. The thing with the 'jobs' is the same with all branches....they'll TRY their best to get you that, but that's why you list others as backups. I wanted to be a C-130 navigator/lodemaster....ended up as crash crew (firefighter). No issues, but kinda wish I had went flying though....
I'd personally recommend that you get into something that'll be transferrable to civilian life......infantry is galant and cool, but the only thing you can 'really' get into is police related work....
EDUCATION - don't screw this part up - get the GIBill....and use all the Tuition Assistance you can get to get as MANY classes under your belt in as quick a time as you can. DO IT....and get your degree quickly...then it'll open a chance to become an officer if you choose to do so. If not, it'll help if/when you get out. I kick myself in the ass for not doing it myself....but I had no 'guidance' when I was younger on my future planning...other than when the party was
Have fun, take TONS of pix, enjoy yourself....as some of the places you'll go are a once in a lifetime experience....