If I don’t want to be open contract, and before I leave for bootcamp I want to try to change my MOS, what can I do?

Please don’t go in the Navy Undesignated. You will have a hard time and not be able to rank up without a rate. Which means you have to wait the 2 years and wait if there’s a rate of which you qualify for opens and who knows what it would be. If you get lucky you’ll get attracted to aviation but who knows.......my advice...speak to an Army recruiter about what you are interested in. Do your research online and see what mos you qualify for in the Army. There’s no guarantee you will get the specific one you want but it’s WAY better than going undesignated in the Navy on a ship with 2k+ boys and girls all cramped up with limited amount of food months at a time. The Army has the more jobs than any other branch. More jobs that translate to civilian jobs as well with certificates etc. please speak to a recruiter and research. Hopefully you find out Army is better and become a dep loss for the Navy.....My experience: I was enlisted in the Navy and my rate was CS. I waited 5 months to ship out. Unfortunately things didn’t work out. I became a dep loss and discharged from the Navy. I’m so glad because I switched to the Army and it was the best decision I’ve made. I did my research on all branches and found the Army fits me best. I wish you the best. If you decide to switch. Just know this in your heart. THIS IS YOUR LIFE! DONT LET NOTHING STOP YOU OR NO ONE. Just because you change your mind about something doesn’t mean your wrong. Man up and tell them what’s going to happen. I had to do the same. Good luck

If you don't bring it up before reporting then you are stuck, and if your ASVAB scores are not in the range, you won't get it anyway.

never accept an open contract!!! tell your recruiter what you want if he says no walk next door and Join the Army!!