SIGNATURE MOMENT U.S. Defense Secretary Chuck Hagel, right, and Canadian Defense Minister Rob Nicholson swap documents as they sign a memorandum of understanding entitled "Cooperation Framework" at the Halifax International Security Forum in Halifax, Nova Scotia, Nov. 22, 2013 SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 272946-L-MED63-517.jpg Photo Gallery