Pope Benedict XVI greets U.S. Defense Secretary Leon Panetta after the pontiff's weekly general audience in Paul VI Hall at the Vatican, on Wednesday, Jan. 16, 2013. Panetta was in the front row at Wednesday's weekly general audience in the Vatican auditorium. Panetta, a staunch Catholic, is in Rome as part of a weeklong swing across Europe, meeting with defense ministers to talk about ongoing conflicts in Afghanistan and Mali. This is expected to be Panetta's last overseas trip as Pentagon chief, as he long has planned to step down once his replacement is confirmed. (AP Photo/Jacquelyn Martin)

Associated Press
Pope Benedict XVI greets U.S. Defense Secretary Leon Panetta after the pontiff's weekly general audience in Paul VI Hall at the Vatican, on Wednesday, Jan. 16, 2013. Panetta was in the front row at Wednesday's weekly general audience in the Vatican auditorium. Panetta, a staunch Catholic, is in Rome as part of a weeklong swing across Europe, meeting with defense ministers to talk about ongoing conflicts in Afghanistan and Mali. This is expected to be Panetta's last overseas trip as Pentagon chief, as he long has planned to step down once his replacement is confirmed. (AP Photo/Jacquelyn Martin)
Pope Benedict XVI greets U.S. Defense Secretary Leon Panetta after the pontiff's weekly general audience in Paul VI Hall at the Vatican, on Wednesday, Jan. 16, 2013. Panetta was in the front row at Wednesday's weekly general audience in the Vatican auditorium. Panetta, a staunch Catholic, is in Rome as part of a weeklong swing across Europe, meeting with defense ministers to talk about ongoing conflicts in Afghanistan and Mali. This is expected to be Panetta's last overseas trip as Pentagon chief, as he long has planned to step down once his replacement is confirmed. (AP Photo/Jacquelyn Martin)