How do I get on deployment? Tour of duty?

We aren't at War with anyone directly at the moment. You can't apply for a deployment to a War that isn't happening. I am sure if you widen your search you could find somebody deploying that needs your MOS. I would warn against reclassing just for a deployment. That is a long term change for short term gain. Unless it is just something you wanted to do already but it's a process to reclass and get trained up so you won't immediately be deploying anyways. I would just work with your Unit to locate a NG Unit deploying that needs your MOS. That's what I would do if you want to deploy sooner rather than later

"Combat Deployments" are pretty much a thing of the past.

Reclassing can be an option, but the issue is will your unit/State approve you to reclass?

Talk with your 3 Shop to see if they know of any NG (in any State) units that are hitting the ramp and need a mechanic. There has to be at least ONE unit going to Kuwait that needs a mechanic

Not sure how it would work on the medical side but when I was in a Resident Office for CI (5 positions, only 2 filled) we pulled in every reservist we could. I'm sure there must be more than a few medical units or facilities that would be happy to pick-up a qualified reservist. Not to mention the advantage your home unit would gain by having a qualified and more experienced 91B in house. If the combat part really interest you check with JRTC, NTC. etc. It as close as you can get to combat, between wars.