The Big City Fire Working Group (BCF) brings together representatives from 12 of the largest fire departments in the United States, as measured by number of stations and operational personnel. BCF members are senior leaders who understand the highest priorities of their departments and collaborate to identify and discuss the needs and challenges of fighting fire in dense urban settings. The S&T's NUSTL convenes and manages the BCF in support of the Directorate’s first responder portfolio and is responsible for setting strategy, executing process and identifying potential research, development, test and evaluation opportunities associated with the group.