[Huffpoo] WASHINGTON -- Weeks before she stepped down as secretary of state, Hillary Clinton wrote a memo urging President Barack Obama to step up his administration's efforts to close the military detention facility in Guantanamo Bay in his second term. In the confidential January 2013 memo obtained by The Huffington Post, Clinton told Obama she worried that support for closing Guantanamo would further erode unless the administration took action."We must signal to our old and emerging allies alike that we remain serious about turning the page of GTMO and the practices of the prior decade," Clinton wrote in the document, using the military abbreviation for the U.S. naval base. "The revitalization of transfers, efforts to prosecute some detainees in federal courts, a longer-term approach to the return of Yemeni detainees, and credible periodic reviews would send the signal and renew a credible detention policy."