EMPIRE SHIELD Pvt. Stephen Perez, a New York Army National Guardsman assigned to Joint Task Foce Empire Shield patrols at Penn Station on Nov. 23, 2010. The more than 200 members of the New York National Guard's standing security force in New York City, are working with the New York Police Department, the Port Authority of New York and New Jersey Police and other law enforcement agencies in security arrangements aimed at protecting holiday travelers. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 050796-F-CET35-262.jpg Photo Gallery