I'm a few years removed from it, but in the past ranger school slots have been available to AD, Guard, Reserves of the army and other services, including the navy.

My guess is that you could get a slot unless your CO C-blocked you for whatever reason.

However...a ranger tab does not mean you will deploy in any capacity other than your current job. They let a variety of folks go to the school to create a pool of tabs, and to enhance army-wide warrior culture.

In order to actually deploy with a ranger battalion, you would have to join one. I don't know of any reserve/guard ranger units, you would have to research that. You could also do ranger school as a reservist, and then if you graduate, try to get a ranger-guaranteed active duty contract.

You would also need to go to jump school to get into the ranger battalions...agin, do it in the reserves to you are not stuck with an AD committment if you fail out.

If you have an aviation job right now, then you would be job (and seniority) protected for reserve training and deployments and even going active duty. The exception would be if there are furloughs, and you would have been furloughed anyway then you will be in a furlough status upon your return from military service.