I can’t knowledgeably speak to the military side of this issue but I have some knowledge basis on the medical side and want to make a small suggestion based on my personal experience.
If your nodules have any size to them whatsoever (.25cm or greater) I would request a FNA biopsy. It’s quick, covered by insurance, and painless (22g needle), and (assuming your doc gets a quality sample) can either get you an early diagnosis or can virtually eliminate an immediate major concern, giving you peace of mind.
When it comes back negative, monitor until you can’t....when it’s time for it to go, rip that sucker out and don’t look back.
If it comes back positive; obvious surgical removal. Go to a specialist who does the procedure 5x per week or more. I personally would stay away from an ablation-type procedure. Microwave is still too relatively untested for my or my family’s taste. Alcohol ablations; well tested but ehh.
My personal experience:
1) My wife has had graves for years....have spent countless late nights doing research and have seen many docs about it. She’s been through the FNA (thankfully negative) and we are currently monitoring/waiting until her thyroid can’t keep up anymore...at that time we’ll call the surgeon (already picked out).
2) I worked in the medical field for years with a direct involvement with thyroid biopsies and thyroid ablations, as well as the studies/research involving both.
3) I close friend of mine (spoke to him about exactly this less than a week ago) got his neck checked out years ago in a matter of sheer coincidence. Thyroid came back enlarged and with nodules, decided to FNA, came back positive and had immediate total removal in addition to a few lymph nodes.
Last piece of advice, as I’m sure you’ve been told, thyroid nodules are much more common in women than males. Read the statistics. Make sure you educate yourself and stay on top of this.
Again, I have no clue what this means about your desired future military service. You didn't start this thread asking for medical advice and I apologize for giving it to you unsolicited. This is just a topic that has immediate impact in my own life and I have some fire in my gut about it.
I’m not an MD, DO, RPA, Nurse, or specialist. Listen to what those guys and gals have to say...I’m just a guy from the internet.