BORDER BRIEFING Alan Bersin, left, commissioner of Customs and Border Protection, responds to reporters' questions during a Pentagon briefing about the upcoming deployment of 1,200 National Guard troops to the U.S.-Mexico border, July 19, 2010. Also participating in the briefing are Air Force Gen. Craig McKinley, chief of the National Guard Bureau, center, and John Morton, director of Immigration and Customs Enforcement. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 676052-S-LGD16-614.jpg Photo Gallery