If you have a problem with your council you should tell him/her so. If that doesn't work, notify the judge. If that doesn't work, don't take the plea and hire a new lawyer. You're entitled to a good lawyer that works for you.
To answer your question, yes, you can withdraw your pleas all the way up to the point the military judge accepts your pleas. You can always back out of plea agreements. You needs military lawyer, immediately. Read my Avvo profile and call me at 855.MIL.JUST. v/r Gerry
What do you mean by military affiliation? Sounds like you are being tried by civilian authorities.
READ THIS BEFORE CALLING OR EMAILING ME: I am licensed to practice before the state and federal courts in Virginia. We have not established an attorney-client relationship unless we have a signed representation agreement and you have paid me. I am providing educational instruction only--not legal advice. You should speak with an attorney to whom you have provided all the facts, before you take steps that may impact your legal rights. I am not obligated to answer subsequent emails or phone calls unless you have hired me. I wish you the best of luck with your situation.
You haven't left yourself or a new attorney much time to consult, sort through the issues and advise you. As a preliminary matter, any offense committed before your sentencing date cannot be used to violate your probation and impose a suspended sentence. If you have doubts about your plea, you should seek to continue the sentencing. Another attorney will have to evaluate the case thoroughly before planning a course of action.