Secretary of Defense Leon E. Panetta, left, listens to NATO Secretary General Anders Fogh Rasmussen, right, as they walk to lunch at NATO headquarters in Brussels, Belgium, on Feb. 21, 2013. Both men are attending the NATO Defense Ministerial meetings in Brussels. The current International Security Assistance Force mission and the follow-on NATO mission in Afghanistan are the central topic of group meetings and Panetta’s own one-on-one discussions with allied and partner ministers here this week.