Listen now (31 min) | One of the great strains on NATO is the question of who’s paying how much for what. But that’s not a new problem. Almost as long as the alliance has been around - 69 years - there’s been arguing over the bills. Germany has been a particular target of late, with the United States calling on the economic powerhouse to pay up. Kathleen Hicks of the Center for Strategic and International Studies offers some needed perspective.