Posted By modernwarfare on 21 Feb 2016 05:12 PM
When you fill out your dream sheet you can put down if you prefer Fireman or Seaman and if that is more important to you or the location of where you end up is more important. When you get to where you are stationed you can tell them what your preference is and ask if they have an opening if you weren't assigned what you want. Someone at my station wanted to be a Seaman and said so when he called from boot camp and they switched him.
I would not recommend asking to switch before you even report to your unit. It seems really unprofessional to me.
Also understand that not all units will allow you to make the change. On our boat they generally only let you switch if you have a demonstrated reason to - you are a deckie putting your name on the MK list, for ex - and there's an opening.