I arrived at Ft Carson and found out my unit just deployed. I haven't inprocessed yet. Will I get stuck on rear D?

You’re probably going to be a dependable SPC team leader on read-d. Good luck.

That depends on several factors, mostly whether you are needed or not. You will most assuredly be certified in the chance that you are needed later, if not now.

That’s really a command decision. Some Soldiers get late deployed, and others are left on Rear D. That decision rests on a bunch of different factors that are levels above anything you can affect.