From the link above….

The Department of Defense announced today that campaign stars are authorized for wear on the Afghanistan Campaign Medal (ACM) and Iraq Campaign Medal (ICM).

The campaign stars recognize a service member’s particpation in DoD designated campaigns in Afghanistan and Iraq.

Service members, who have qualified for the ACM or ICM, may display a bronze campaign star on their medal for each designated campaign phase in which they participated. The stars will be worn on the suspension and campaign ribbon of the campaign medal.