One year ago: A man carrying a bag with a note that said he "wanted to kill TSA" opened fire with a semi-automatic rifle at a security checkpoint at Los Angeles International Airport, killing a TSA officer and wounding two others; the gunman, who was wounded, was taken into custody. (Gerardo Hernandez, 39, became the first TSA officer in the agency's 12-year history to be killed in the line of duty; Paul Ciancia pleaded not guilty to 11 federal charges, including murder of a federal officer.) A U.S. drone strike killed Hakimullah Mehsud (hah-kee-MUH'-lah meh-SOOD'), leader of the Pakistani Taliban.