You should really take a look at this MOS handbook (from the TBS website). It gives a good overview of each MOS and its career path. Make sure to note all the Category I MOS's that guarantee that you will stay in your MOS for your entire career. For unrestricted (Category I) officers, there are none.
If you want more information, find MCO 1200.7Y (MOS Manual). Only Warrant Officers and Limited Duty Officers (Cat II & III) stay in their field forever.
https://www.tbs.usmc.mil/Pages/Downloads/MOS/MOS Handbook.pdf
If you want more information, find MCO 1200.7Y (MOS Manual). Only Warrant Officers and Limited Duty Officers (Cat II & III) stay in their field forever.
https://www.tbs.usmc.mil/Pages/Downloads/MOS/MOS Handbook.pdf