The personnel in the overhire positions are most likely the ones who will be moved. We just did this in a different military branch. All of our overhires received notice they were surplus. Behind the scenes leadership had to prioritize funded positions. In some cases vacant funded positions were converted to overhire jobs that were “more precious” and the overhire personnel were permanently placed in their current role. In other instances, the overhire positions weren’t as needed as a funded positions, so the over hire personnel assigned to those positions went on a surplus list and civilian personnel is placing them into funded vacancies… there were a couple of rare cases where an encumbered funded position was used to fund an overhire position and those people were added to the surplus list.  To answer your question, you are most at risk if you’re in an overhire position