English: NEW YORK - James Waters, New York Police Department's Chief of Counterterrorism, joined by Secretary of Homeland Security Jeh Johnson, along with Mayor of New York Bill de Blasio, New York City Police Commissioner Bill Bratton, Fire Commissioner Daniel Nigro, and Emergency Management Commissioner Joseph Esposito, speaks at a press conference to discuss NYPD’s active shooter training exercise that was conducted at the Bowery subway station in Lower Manhattan, Nov. 22, 2015. This exercise allowed DHS Science and Technology’s Homeland Security Advanced Research Projects Agency’s Explosives Division team to observe first responders using several tools that can be translated for use by DHS and other first responders. Official DHS photo by Barry Bahler.