Are campaign stars always worn on both the medal and ribbon bar or just one?

thanks

dan

They are worn on the ribbon bar. For example if you see three bronze stars:

• They are "ribbon devices" for participation in major campaigns
  
• The three stars on an ETO ribbon means a veteran served in 3 campaigns in the European Theater of Operations. If a vet was in more than 5 campaigns - the bronze stars would've been replaced by one silver star.
  

That's what I thought. So why do all the medals on Ebay have them on both the medal and ribbon bar? I knew I'd get the right answer here. Thanks again.

I should have made that more clear. The Bronze Campaign Stars can be worn on the ribbon of the actual medal too. See this example.