I am currently an E5 in the Army Reserves. I will be promoted on the 9th to E6. I signed up to be an AGR Reserve recruiter and my career counselor is telling me that if I do not stay in my reserve unit for a atleast a year after being promoted, I will lose my new E6 rank when I go AGR. Is this true and if it is true where can I find the regulation that states if it is true or not???

Hopefully you already found out this is not true, your career counselor needs retraining.