Are you sure you have a realistic view of working on trauma, especially with soldiers, in the current era? The combination of modern bulletproof helmets and clothing with the almost immediate availability of good medical care allow the survival of some horrendously wounded people for whom we can do a lot, but not, by far, enough. For example, a soldier can loose al his limbs due to a IED, be burnt over large parts of the rest of his body, and survive.

I think I would rather work with elderly people even if comfort is almost all we can give them.

Also, if you went into the field, I bet your educators would try to get you change your opinion. Everybody wants the glamorous job, but most employment is elsewhere. I have heard this phrased as "all the girls want to work with children, and all the boys want to work in ambulances; we need to work a bit to change their minds."

Yes. I worked in US military hospitals in Iraq and Afghanistan from 2008-2010, as well as spending some time in them in 2003-2007. I also spent a fair bit of time in third world clinics (in North Africa, Middle East, Southwest Asia, and also Iraq/Afghanistan), where the main care was for sickness or maternity, including working with NGOs.

The US hospitals also had plenty of local nationals coming in, either due to trauma, or due to illness. I also got to go out with some teams (i.e. the "other" people) when they did medical outreach. A few of my friends are Army SF medics, I lived with an Air Ambulance company for most of 2005, and dated a (non-US, coalition partner) doctor for a few months. I did combat lifesaver and some other advanced first aid stuff, and dive medic. I did get to help out with trauma a fair bit, and I've been first responder at a bunch of traffic accidents worldwide.

Actually, neuroradiology would be my #1 pick (I hate being around conscious patients, and even talking to people who talk to conscious patients is bad. A rad at least talks to other specialists, and a neurorad is going to talk to specialists (rads, neurosurgeons) who talk to other specialists (surgeons, oncologists) who talk to normal doctors who talk to patients, so you're pretty far removed. ER docs are kind of looked down on by other doctors (for basically being stream of consciousness, get them in, patch them up, pass them along), but trauma surgeons are well respected. There's clearly a lot of money in gerontology, and demand for internal medicine (although badly paid, and often in crappy parts of the country), but I'd hate those things.

However, I'm doing a non-medical startup, and going to med school seems very unlikely to be in my future.