In the February-March 2009 issue of Survival ('Closing Guantanamo: Is Europe Ready?', vol. 51, no. 1, pp. 5-12) Sibylle Scheipers discussed the role of US President Barack Obama's moves to reform the detention system as a step towards renewing close transatlantic ties and facilitating transatlantic cooperation. But she also argued that it poses a difficult challenge to Europeans. Survival invited comments from three distinguished experts, and Scheipers to respond.