I would love to hear your reasons/insight
I've written them multiple times in this thread.
In specific reference to your reasons for joining:
-service to the US
That is the best reason to join. That being said, I can honestly say that I don't feel like I really provided any service to my country that I couldn't have provided more efficiently as a civilian who accepts Tricare or works in a VA. I never deployed, and most in my specialty never do, so that could be a part of it. Plus, if you join the Army and get sent to a brigade surgery spot as a surgeon, the way you'll serve your country is by sacrificing your skill set on the altar of poor resource utilization. You do get to treat soldiers and their families, and that is great. Hopefully it's enough. The biggest sacrifice I made for the US was not climbing a bell tower due to the inordinate amount of idiocy I had to wade through each and every day. It wasn't exactly what I had hoped it would be when I signed up. But, that's life.
Debt Free
Yeah, sure. Of course in more than a couple of specialties you'll end up behind your civilian peers financially before you get out. I still argue that, save for maybe primary care, you'll get your debt cleared one way or another. As evidenced by the majority of physicians who do not take HPSP and yet still survive. Then there are things like the military reclaiming chunks of your pay when they decide to alter their pay scheme, and charging you interest on it.
Journey over destination
I would actually say this is a reason -not- to join. At the destination, if you're lucky, you'll have an experience to look back on and be proud of. The journey is a straight $#!tstorm start to end. Inefficiency, incompetence, poor management, zero value placed on your clinical acumen, you're just a tool in a toolbox, no more educated or capable than a 17 year old pfc. until something goes wrong, and then it's entirely on you. You'll have to fight your own people every single day of your career just to try to do your job. At first it will be because you really thought the point was to take care of people. Then you'll start to do it because you'll be fearfully watching your skills fade away from lack of use. All that, and you may be doing it in the least interesting place you can imagine, like KS or OK. That journey -sucks-.
Pride
I have a lot of green in my gene pool too. But looking back, I'd have been equally as proud just being a physician. That was an accomplishment. I don't consider my military service an accomplishment any more than that I survived it professionally. And I did it to myself. So it would be akin to taking pride in paying off a gambling debt.
If you pick primary care, you'll be better off in many ways than you would be on the civilian side. If you pick anesthesia? Well, I'm no anesthetist, but the few physicians I've actually met (and keep in kind I do surgery every week, it's just that 99% of the anesthetists are CRNAs) all more than doubled tgeircpay by moonlighting. The exception being a civilian contractor. But you will definitely not be expected to do a ton of cases...at least not in the Army. Good if you aren't interested in working. Bad if you want to do mostly cardiac.
Trust me when I say that most of my reasons for joining mirrored your own. Back before I actually spent time as a physician in the Army. In fact, my reasons mirrored yours until about 3/4 of thecway through my residency, when the veneer started to chip off what the Army was. Ask guys who have been in a long time - more than 12-15 years. I've been making it a point to do that. At least in the Army, the results are fascinating in their similarity. They all say things have continuously become worse since they joined.