USAF enlisted personnel who initially accessed through BMT who later complete officer accession training (i.e., OTS, AFROTC, USAFA and so forth) are entitled to a subsequent award denoted by an oak leaf cluster.
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Initial accession training in USAF is defined as Basic Military Training (BMT) for enlisted personnel, Basic Cadet Training (BCT) at the United States Air Force Academy (USAFA), or commissioning through Air Force ROTC (AFROTC), Officer Training School (OTS) or other specialized USAF officer accession programs.