Final answer:
The reenlistment code used when HQ AFPC denies a member's reenlistment is typically RE-4 or RE-4F. An RE-4 code indicates ineligibility due to various conduct or fitness reasons, while the RE-4F code is used for fraudulent enlistment. Different branches of the military may have different codes.
Step-by-step explanation:
In the case where the Headquarters Air Force Personnel Center (HQ AFPC) denies a member's reenlistment, the reenlistment code used is typically RE-4 or RE-4F.
An RE-4 code indicates that the member is not eligible for reenlistment due to specific reasons such as moral or personal conduct, drug abuse, or being deemed unfit for military service. The RE-4F code is used when the denial is related to fraudulent enlistment.
It's important to note that reenlistment codes may vary depending on the branch of the military and their specific regulations.