What’s the process of reclassing to 11B and becoming a drill sergeant?

You are putting the cart before the horse if you are looking at doing both simultaneously. If you reclass to a new job field you will need to spend some time
in that field to gain profiency. Once you do that go ahead and hit the Drill Field but thinking you can lat move and go immediately into the drill field and be good at your job isn’t realistic.

Simple, once you return from your deployment, contact a local recruiter. If the MOS is available (needs of the Army have always first) then you’re good to go. If not, sign for whatever is offered or wait until 11B is available, your choice. Now, the DS part, you need to at least be a SGT/E5 to volunteer.

I am a retired Airborne Light infantryman Joe, In order to get into the reserves you had to go to basic training as well to the MP school. I can tell you that the 11B field is always wide open due to the constant need of infantrymen not only in the army but the Marine Corps as well. One thing that you have to do, is be released from the reserve status before the army or any other branch of service can process you into active duty status!!. SFC Chuck Martinez retired!