Looks like bronze oak cluster.
Condition: good, minor scratches. Ribbon has some blue ink transfer into yellow.
The Air Force Commendation Medal is awarded to American and foreign military personnel in the grade of O-6 and below who have performed noteworthy service in any capacity with the United States Air Force. Qualifying service for the award of the medal can be for distinctive meritorious achievement and service, acts of courage involving no voluntary risk of life, or sustained meritorious performance of duty. Approval of the award must be made by an officer in the grade of Colonel or higher.
Additional awards of the Air Force Commendation Medals are denoted by bronze and silver oak leaf clusters.