Who owns the military star card?

Could you please clarify who exactly holds ownership of the military star card? Is it a government entity, a specific military branch, or is it an individual servicemember who is issued the card? Additionally, are there any specific requirements or eligibility criteria that need to be met in order to obtain or possess the military star card? It would be greatly appreciated if you could provide a concise and straightforward explanation of the ownership and distribution of the military star card.