From left, Canadian Forces Lt. Gen. Jan Arp, Marine Corps Gen. James N. Mattis and British Royal Navy Vice Adm. Robert G. Cooling perform a signing ceremony during the change of responsibility for the position of chief of staff of NATO?s Headquarters, Supreme Allied Commander Transformation July 14, 2009, in Norfolk, Va. Cooling relieved Arp as chief of staff during the ceremony. Master Sgt. Chris Steffen, Air Force

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