HM's have the worst advancement rate in the entire Navy. You're going to PNA your entire career. To give you a real world example, there's a fleet returnee HM re-rated (by choice) here with 4 years in. He's an E-3. If you want to do it, by all means go FMF and play with the marines. But don't go in thinking you're going to fast track to chief. You will have to do RDC shore duty if you want to be an E-7.
Specifically for HM, on the last cycle 6,288 eligible E-3's passed the exam, but only 1,065 were tapped to advance to E-4.
You will notice when you get to RTC that all RDC's have the same handful of rates. These rates all have terrible advancement because everyone wants to be an HM, MA, a seabee, aircrew, or pretty much any aviation rate, a CS, a BM, and a GM.
Pick what you love, just make sure you know what you're walking into for the next small chunk of your life.
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